which of the following is a condition that must be satisfied to use a chi-square goodness-of-fit test? which of the following is a condition that must be satisfied to use a chi-square goodness-of-fit test? the sample size is greater than 30. the number of categories is less than 10% of the number of observations. the expected count is the same for each category. the population distribution is approximately normal. the expected count for each category is at least 5.

The 69.15% of the corks produced by the machine are acceptable. 80% of all corks produced by the machine have diameters less than 3.0772cm.

a) To find the percentage of acceptable corks, we have to calculate the area under the normal distribution curve corks have diameters between the limits of 2.95 cm and 3.05 cm.

Let X be the diameter of the corks produced by the machine. Then X follows a

The corks with diameters that have a normal distribution with mean μ = 3.01 cm

Standard deviation σ = 0.08cm.

Using the standard normal distribution, we can standardize X as follows:

Z = (X - μ) / σ

= (X - 3.01) / 0.08

The probability that Z lies between (2.95 - 3.01) / 0.08 = - 0.75

The probability that Z lies between(3.05 - 3.01) / 0.08 = 0.50.

Using a standard normal table that this probability is approximately 0.6915.

Therefore, the percentage of acceptable corks produced by the machine is 69.15%.

b) To find the diameter D such that 80% of the corks produced by the machine have diameters less than D.

Using the standard normal distribution the Z-score that corresponds to the 80th percentile is:

Z = InvNorm(0.8)

= 0.84

We can then solve for D:

D = μ + Zσ

= 3.01 + 0.84(0.08)

= 3.0772

Therefore, 80% of all corks produced by the machine have diameters less than 3.0772cm.

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The function is both increasing and decreasing on the interval [-2, 1]. The y values decrease from 12 to 0 and then increase to 7.5 through 6. Therefore option B is correct answer.

In mathematics, a function is an expression, rule, or law that establishes the relationship between two variables (the dependent variable). In mathematics, functions are everywhere, and they are crucial for constructing physical relationships in the sciences. German mathematician Peter Dirichlet first offered the modern definition of function in 1837.

Y and x are related in such a way that there is a distinct value of y for each value of x, and this relationship is frequently represented as y = f(x), or "f of x." In other words, the same x cannot have more than one value for f(x). The domain and range of the function are the set of values of f(x) that are produced by the values in the domain of the function, which is the set of values of x. In addition to f(x), other abbreviated symbols for functions of the independent variable x include g(x) and P(x), especially when the nature of the function is ambiguous or unspecified.

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The two square roots of 225 are +15 and -15.

However, since negative values are usually not considered answers for practical purposes, the principal square root of 225 is +15 (i.e., √225 = 15).

The probability of the next spin landing on red or green or yellow is approximately 85%.

what is probability?

Probability is a measure of the likelihood or chance of an event occurring. It is a number between 0 and 1, where 0 indicates that the event is impossible and 1 indicates that the event is certain to occur.

In the given question,

The total frequency of all colors is:

19 (red) + 4 (blue) + 11 (green) + 15 (yellow) + 4 (purple) = 53

The probability of the next spin landing on red or green or yellow is the sum of the frequencies of these colors divided by the total frequency:

(19 + 11 + 15) / 53 = 45 / 53

To express this as a percent to the nearest whole number, we can multiply by 100 and round to the nearest whole number:

(45 / 53) * 100 ≈ 85%

Therefore, the probability of the next spin landing on red or green or yellow is approximately 85%.

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Answer:

Step-by-step explanation:

73%

The perimeter of triangle XYZ with the vertices, X(2, 5), Y(10 9), and Z(6, 1), is approximately 24.07 units.

To find the perimeter of the triangle, we need to add up the lengths of all three sides. To do this, we can use the distance formula, which is:

d = √[(x2 - x1)² + (y2 - y1)²]

Using this formula, we can find the length of each side of triangle XYZ:

Side XY:

d = √[(10 - 2)² + (9 - 5)²] = √64 + 16 = √80

Side YZ:

d = √[(6 - 10)² + (1 - 9)²] = √16 + 64 = √80

Side ZX:

d = √[(6 - 2)² + (1 - 5)²] = √16 + 16 = √32

Therefore, the perimeter of triangle XYZ = XY + YZ + ZX = √80 + √80 + √32

Perimeter ≈ 24.07 (rounded to two decimal places)

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Answer:

A

Step-by-step explanation:

in any right triangle the sine ratio of an angle Θ is

sinΘ = [tex]\frac{opposite}{hypotenuse}[/tex]

The graph that represents a function is the absolute value graph

The vertical line test is a way to determine whether a graph represents a function or not.

To apply the vertical line test, we draw a vertical line through the graph.

The graph that represents a function using the above as a guide is the absolute value graph in option a

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The measure οf the center that is mοst apprοpriate tο represent the data in the line plοt graph is -

Optiοn A: The median is the best measure οf center because there are nο οutliers present.

A line plοt is a graph that uses symbοls tο represent data abοve a frequency number line tο indicate the frequency οf each value. It is emplοyed tο arrange the data simply and is very simple tο understand.

Since the data is displayed using a line plοt and the plοt shοws the frequency οf data values, it is clear that the data is discrete.

In this case, the apprοpriate measure οf center wοuld be the median, which is the middle value when the data is arranged in οrder.

The fact that there are sοme dοts abοve certain values suggests that these values οccur mοre frequently in the data set.

Hοwever, this dοes nοt necessarily mean that there are οutliers present. Outliers are extreme values that are far away frοm the majοrity οf the data and can skew the results when using the mean as a measure οf center.

Therefοre, the median is the mοst apprοpriate measure οf center in this case because it is nοt affected by the presence οf οutliers and it represents the middle value οf the data set.

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One polygon has 6 sides and the other has 7 sides.

Polygons are closed 2D shapes made up of straight lines. Regular polygons have sides of equal length and angles of equal measure. In this problem, we are given information about two regular polygons.

We are told that the total number of sides in both polygons is 13. Let's call the number of sides in one polygon "n" and the number of sides in the other polygon "m". Then, we know that:

n + m = 13

Next, we are given the total number of diagonals in both polygons, which we can calculate using the formula:

d = (n(n-3) + m(m-3))/2

where "d" is the total number of diagonals. We are told that d = 25. Substituting this value and the equation for n + m into the diagonal formula, we get:

25 = (n(n-3) + m(m-3))/2

25 = (n² - 3n + m² - 3m)/2

50 = n² - 3n + m² - 3m

We can use the equation n + m = 13 to solve for one variable in terms of the other. For example, we can solve for "m" by subtracting "n" from both sides:

m = 13 - n

Substituting this into the previous equation, we get:

50 = n² - 3n + (13-n)² - 3(13-n)

50 = n² - 3n + 169 - 26n + n² - 36 + 3n

Simplifying this equation, we get:

2n² - 26n + 45 = 0

We can use the quadratic formula to solve for "n":

n = (26 ± √376)/4

n ≈ 5.61 or n ≈ 8.39

Since we are dealing with whole numbers of sides, "n" must be either 6 or 8. Plugging each value into the equation n + m = 13, we find that the other polygon must have the opposite value.

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(a) The experimental probability of rolling a 3 is approximately 8%.

(b) The experimental probability of rolling a 6 is 25%.

(c) The experimental probability of rolling a number less than 4 is 50%.

The experimental probability of rolling a 3 can be determined from the result presented in the table as shown below.

from the result presented, there a total outcome of 12

number of rolling a 3 in the result = 1

P(3) = 1/12 = 0.083

P(3) ≈ 8%

The experimental probability of a rolling a 6 is calculated as;

number of 6 obtained in the result = 3

P(6) = 3/12

P(6) = 0.25

P(6) = 25%

The experimental probability of rolling a number less than 4:

P ( less than 4) = P(1) + P(2) + P(3)

P ( less than 4) = 17% + 25% + 8%

P ( less than 4) = 50%

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Answer:

y=6x+22

Explanation:

Parallel lines have the same slope and different y-intercepts.

So, all the lines with different slopes will be eliminated.

Now, we can check which line passes through the point (3,4) by substituting x for the x coordinate and y for the y coordinate.

y=6x+22

4=6(-3)+22

4=-18+22

4=4

So, the correct answer is y=6x+22.

The time to reach the maximum height is 3 seconds and the maximum height is 44.1 meters, and other solutions are below

To do this, we find h when t = 0

From the graph, we have

h(0) = 70

So, the height of the cannot at launch is 70 meters

From the graph, we have the vertex to be

Vertex, (t, h) = (3, 114.1)

So, the time to reach the maximum height is 3 seconds

From the graph, we have the vertex to be

Vertex, (t, h) = (3, 114.1)

So, the maximum height is 114.1 meters

This is when h(t) = 0

From the graph, we have

h(7.93) = 0

So, the time spent is 7.93 seconds

The given equation is

h(t) = -4.9t^2 + 29.4t + 70

If the initial velocity changes, then the equation becomes

h(t) = -4.9t^2 + 40.5t + 70

The given equation is

h(t) = -4.9t^2 + 29.4t + 70

If the initial height changes, then the equation becomes

h(t) = -4.9t^2 + 29.4t

We have

h(t) = -4.9t^2 + 29.4t

Differentiate and set to 0

-9.8t = -29.4

So, we have

t = 3

Next, we have

h(3) = -4.9 * 3^2 + 29.4 * 3

h(3) = 44.1

So, the time to reach the maximum height is 3 seconds and the maximum height is 44.1 meters

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We can simplify the expression as follows:

p/(p² - 7) ÷ p²/(p² - 49)

= p/(p² - 7) * (p² - 49)/p² (by flipping the second fraction and multiplying)

= p(p + 7)(p - 7)/(p² - 7)(p²)

= (p + 7)(p - 7)/(p²)

Now, we can write this expression in the form of a + b/p as follows:

(p + 7)(p - 7)/(p²) = (p² - 49 + 2 * 49p)/(p²)

= 1 - 49/p² + 98/p³

Therefore, we can write the expression as:

p/(p² - 7) ÷ p²/(p² - 49) = (p + 7)(p - 7)/(p²) = 1 - 49/p² + 98/p³

So, we have expressed the given expression in the desired form of a + b/p where a = 1 and b = 0 and they are both integers.

The minimum about of balls she should pick is 13.

So, the woman consider all the balls and picks the balls without looking,

To have a clear chance of picking at least 3 blue balls from the bowl she has to first eliminate the possibility of picking red balls.

Therefore,

She first picks 10 balls from the bowl, which gradually eliminates the possibility of picking a red ball.

now, she picks 3 more balls from the rest of the available balls which increases the changes of the balls being blue.

then,

=> 10 + 3 = 13

The minimum about of balls she should pick is 13.

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The probability of flipping the unfair coin given that we observed five tails in a row is approximately 0.9048

Let's define

A: the event of picking the unfair coin

B: the event of getting five tails in a row

We want to find the conditional probability of picking the unfair coin given that we observed five tails in a row, or P(A|B).

Using Bayes' theorem, we have

P(A|B) = P(B|A) × P(A) / P(B)

P(B|A) is the probability of getting five tails in a row given that we are flipping the unfair coin. Since the unfair coin is not fair, we don't know its probability of coming up as tails, but let's assume it has a probability of 0.9 of coming up as tails. Thus, P(B|A) = 0.9^5 = 0.59049.

P(A) is the prior probability of picking the unfair coin, which is 0.5 since we picked one of two coins at random.

P(B) is the total probability of getting five tails in a row, which is the sum of the probabilities of getting five tails in a row with the fair coin and the unfair coin.

The probability of getting five tails in a row with the fair coin is 0.5^5 = 0.03125. The probability of picking the unfair coin and getting five tails in a row is P(B|A) × P(A) = 0.59049 × 0.5 = 0.295245. Thus, P(B) = 0.03125 + 0.295245 = 0.326495.

Now we can calculate P(A|B)

P(A|B) = P(B|A) × P(A) / P(B) = 0.59049 × 0.5 / 0.326495 = 0.9048

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The graph of the triangle PQR is created by connect the three vertices.

A triangle is a three-sided polygon with three angles. It is a fundamental geometric shape and is often used in geometry and trigonometry. A triangle is a clοsed, 2-dimensiοnal shape with 3 sides, 3 angles, and 3 vertices. A triangle is alsο a pοlygοn.

To graph the triangle PQR, we first plot the three vertices P(-2,4), Q(3,4), and R(-2,-2) on a coordinate plane:

Now, we connect the three vertices to form the triangle PQR:

Thus, the graph of the triangle ΔPQR is shown in the attachment..

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Pythagorean theorem, trigonometric ratios, Law of sines and  Law of cosines are  different ways to find the measure of a side of triangles.

There are different ways to find the measure of a side of a triangle;

 The theorem states that the square of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides. Therefore, if a and b are the lengths of the legs of a right triangle and c is the length of the hypotenuse, we have c²= a² + b².

if we know the measure of one acute angle (other than the right angle) and the length of the adjacent side to that angle, we can use the cosine function to find the length of the hypotenuse, or the sine function to find the length of the opposite side.

The law states that the ratio of the length of a side to the sine of the angle opposite that side is the same for all sides and angles of the triangle. Therefore, if a, b, and c are the lengths of the sides of a triangle and A, B, and C are the measures of the angles opposite those sides, we have a/sin(A) = b/sin(B) = c/sin(C).

The law states that the square of a side is equal to the sum of the squares of the other two sides minus twice the product of those sides and the cosine of the included angle. Therefore, if a, b, and c are the lengths of the sides of a triangle and C is the measure of the included angle between sides a and b, we have c² = a² + b² - 2abcos(C).

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Answer:

x = -1

y = 2

Step-by-step explanation:

2x + 6y = 10

-3x + 1y = 5

Time the second equation by -6

2x + 6y = 10

18x - 6y = -30

20x = -20

x = -1

Now put in -1 for x and solve for y

2(-1) + 6y = 10

-2 + 6y = 10

6y = 12

y = 2

Let's Check

2(-1) + 6(2) = 10

-2 + 12 = 10

10 = 10

So, x = -1 and y = 2 is the correct answer.

The answer to the question, "What percentage of the world's land area has been granted some degree of protection in a park or preserve?" is 15%.

What is a protected area?

A protected area is a defined geographical space, recognised, dedicated and regulated, through legal or other effective means, to achieve the long-term conservation of nature with associated ecosystem services and cultural values.

How does a protected area achieve conservation?

A protected area, by definition, is a place dedicated to the protection and maintenance of biodiversity and other natural and cultural resources of the area. Protected areas often encompass critical habitats, ecosystems, and landscapes. They offer essential ecological, economic, social, and cultural benefits to society.Conservation objectives are reached by restricting, regulating or prohibiting human activities in the protected area. Some common ways in which protected areas achieve conservation goals include:Enforcing regulations, including limits on extractive and polluting activities.Monitoring and managing species, ecosystems and landscapes to ensure their continued viability and integrity.Restoring degraded habitats or managing them for their long-term health and function.

What is a National Park?

A national park is a natural or semi-natural space designated to protect natural and cultural resources. National parks are established by governments to preserve a country's heritage, usually with the aim of promoting recreation and tourism.

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The work done in the process of lifting coal up a mineshaft that is 632 feet deep is found to be  650,000 ft/lb.

For a cable of density, work = ∫k*y dy from 0 to b.

where k is the linear density of the cable (in lb/ft in this case), y is the distance from the top of the cable, and b is the total distance the weight has to travel to the bottom of the cable.

With this setting, the top of the cable should be labeled y=0 and the bottom of the cable (connected to the coal weight) should be labeled y=b. In this case, k = 2 ft/lb and b = 500 ft.

The 800 lb coal weight is additional information that we have not yet calculated.

Since pounds are a unit of force and the force to lift the coal is constant at 800 pounds, you can add the weight of 800 pounds to the integral and the work done to lift the coal is force * distance . The final integral is:

work = ∫(2y + 800) dy from 0 to 500.

integral:

Work = y2 + 800y | 0 to 500

= (500)2 + 800(500)

So, the work done is 650,000 ft/lb.

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Complete question - A cable that weighs 2 lb/ft is used to lift 800 lb of coal up a mine shaft 500 ft deep. Find the work done.

A big square with 100 squares in the whole square. 5 of those squares are shaded. The shaded area as both a fraction and a decimal is expressed as:

Fraction: 5/100

Decimal: 0.05

In the form of a numerator and a denominator, fractions express a portion of a whole. Decimals are used to express fractions with a denominator of a power of ten, such as 10, 100, or 1000, in numerical form. Arithmetic is the representation of fractions in their decimal form, where the denominator is 10 or a power of 10 more, such as 100, 1000, or 10,000, etc.

Given:

Area of the whole square = 10 by 10

= 10×10 = 100unit²

The shaded area expressed as a fraction = 5unit²/100unit²

= 51/100

Shaded area expressed as a decimal = 5/100

Then take the number 5 and carry the point by two decimal place from the right

= 0.05

Shaded area expressed as a percent of the whole = (5/100) × 100

= (5×100)/100

= 5%

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Answer: 48

Step-by-step explanation: 1/4 goes into 1 four times: 4x12=48

a. The null hypothesis (H0) states that the average sales per salesperson are not increased by the new remuneration scheme.

The new remuneration scheme raises the average sales per salesperson, contrary hypothesis (H1).

b. a Type I error occurs if it is concluded that the new compensation plan provides a population mean weekly sales increase when, in fact, it does not.

c. a Type II error occurs if it is concluded that the new compensation plan does not provide a population mean weekly sales increase when, in fact, it does.

a. The appropriate null and alternative hypotheses are :

Null hypothesis (H0): The new compensation plan does not increase the average sales per salesperson.
Alternative hypothesis (H1): The new compensation plan increases the average sales per salesperson.

b. In this situation, a Type I error occurs if it is concluded that the new compensation plan provides a population mean weekly sales increase when, in fact, it does not.

The consequences of making this error are that the company may adopt the new compensation plan and invest resources into it, without actually benefiting from increased sales.
c. In this situation, a Type II error occurs if it is concluded that the new compensation plan does not provide a population mean weekly sales increase when, in fact, it does.

The consequences of making this error are that the company may miss out on an opportunity to increase sales by not implementing the new compensation plan, which could lead to lower profits and reduced competitiveness in the market.

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If you were not restricted to using just rectangles to fill up the space between the curve and the x-axis, a different geometric shape that might give a more accurate estimate for this area is a trapezoid.

Using trapezoids would likely yield a more accurate result because they can better approximate the curve's shape.
Here's a step-by-step explanation of how using trapezoids can provide a more accurate estimate:

Divide the interval on the x-axis into equal subintervals.

In each subinterval, form a trapezoid by connecting the endpoints of the subinterval to the curve and then closing the shape by drawing a horizontal line from the curve to the x-axis

Calculate the area of each trapezoid using the formula: A = (1/2) * (base1 + base2) * height, where base1 and base2 are the lengths of the parallel sides of the trapezoid (the lengths along the x-axis and the curve), and the height is the length of the vertical line connecting the two bases (the width of the subinterval)

Sum the areas of all trapezoids to approximate the total area between the curve and the x-axis.

The reason trapezoids can provide a more accurate estimate is that they can closely follow the shape of the curve, especially when the curve is not a straight line. Since trapezoids have two different base lengths, they can better accommodate the changes in the curve's slope within each subinterval. This results in a closer fit to the curve compared to using rectangles, which can overestimate or underestimate the area depending on the curve's concavity.

Overall, using trapezoids for estimating the area under a curve can provide more accurate results, especially as the number of subintervals increases.

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We predict that there will be 512 viruses in the dish after 7 hours.

To model the population growth of the viruses in the dish, we can use a geometric sequence with a common ratio of 2, because the number of viruses doubles every hour.

Let Vn be the number of viruses in the dish after n hours. Then we have:

Recursive formula: Vn = 2Vn-1, with V0 = 4 (since we start with 4 viruses).

Explicit formula: Vn = 4 × 2n.

To predict how many viruses will be in the dish by the 7th hour, we can plug n = 7 into the explicit formula:

V7 = 4 × 27 = 4 × 128 = 512.

Therefore, we predict that there will be 512 viruses in the dish after 7 hours.

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Answer:Option(a)

Step-by-step explanation: A) 2 of 15

To find the average rate of change of a function over a given interval, we need to calculate the change in the function over that interval, and divide by the length of the interval.

In this case, we want to find the average rate of change of the function f(x) = 12x - 4.8x^2 over the interval [0,5].

First, we need to find the value of the function at the endpoints of the interval:

f(0) = 12(0) - 4.8(0)^2 = 0

f(5) = 12(5) - 4.8(5)^2 = -72

Next, we calculate the change in the function over the interval:

Change in f(x) = f(5) - f(0) = -72 - 0 = -72

Finally, we divide the change in the function by the length of the interval:

Average rate of change = (Change in f(x)) / (Length of interval) = (-72) / (5-0) = -14.4

Therefore, the average rate of change of the function f(x) = 12x - 4.8x^2 over the interval [0,5] is -14.4.

Answer:

To show this, we can simplify both fractions to a common denominator and compare them.

First, we can simplify 8/18 to 4/9 by dividing both the numerator and denominator by 2.

Then, we can compare 4/9 to 4/9.

Since both fractions are equal, we know that 4/9 is half of 8/18.

Alternatively, we can cross-multiply and simplify to compare the fractions:

4/9 = (1/2) * 8/18

4/9 = 4/9