I will give brainliest to the right answers
please help

Answer:

Sydney will be 154.94cm

Testing the hypothesis in this problem which is a two-tailed test, we can conclude that there is not sufficient evidence to conclude that the mean time of installation has changed, since the p-value of the test is 0.0364 > 0.01,

At the null hypothesis, we test if the mean is of 25 minutes, that is:

[tex]H_0: \mu = 25[/tex]

At the alternative hypothesis, we test if the mean has changed, that is, if it is different than 25 minutes.

[tex]H_1: \mu \neq 25[/tex]

We have the standard deviation for the sample, thus, the t-distribution is used. The value of the test statistic is:

[tex]t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}[/tex]

In which:

In this problem:

The value of the test statistic is:

[tex]t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}[/tex]

[tex]t = \frac{26.2 - 25}{\frac{4}{\sqrt{51}}}[/tex]

[tex]t = 2.14[/tex]

Since the p-value of the test is 0.0364 > 0.01, there is not sufficient evidence to conclude that the mean time of installation has changed.

A similar problem is given at https://brainly.com/question/23777908

Answer:

Step-by-step explanation:

54/5=10 4/5

Answer:

The top of the ladder is sliding down at a rate of -1.25 ft/s.

Step-by-step explanation:

From the Pythagorean Theorem:

[tex]\displaystyle a^2 + b^2 = c^2[/tex]

(Where a is the height, b is the distance between the bottom of the ladder and the wall, and c is the length of the ladder itself.)

Note that the hypotenuse c is a constant value at 26 feet. Substitute:

[tex]\displaystyle a^2 + b^2 = (26\text{ ft})^2 = 676 \text{ ft}^2[/tex]

We want to determine how fast the top of the ladder is sliding down the wall at the instant of time when the bottom of the ladder is 10 feet from the wall and sliding away from the wall at the rate of 3 ft/s.

In other words, we want to find da/dt given that b = 10 ft, and db/dt = 3 ft/s.

First, we can differentiate both sides with respect to t, where a and b are both functions of t:

[tex]\displaystyle \frac{d}{dt}\left[ a^2 + b^2\right ] = \frac{d}{dt}\left [ 676 \text{ feet}^2\right ][/tex]

Implicit differentiation yields:

[tex]\displaystyle 2a \frac{da}{dt} + 2b \frac{db}{dt} = 0[/tex]

Next, since we know that b = 10 ft, we can find a:

[tex]\displaystyle \begin{aligned} a^2 + b^2 & = 676\text{ ft}^2 \\ \\ a^2 +(10 \text{ ft})^2 & = 676\text{ ft}^2 \\ \\ a & = 24\text{ ft} \end{aligned}[/tex]

Substitute and solve for da/dt:

[tex]\displaystyle \begin{aligned} 2a \frac{da}{dt} + 2b\frac{db}{dt} & = 0 \\ \\ 2(24 \text{ ft}) \frac{da}{dt} + 2(10 \text{ ft})(3 \text{ ft/s}) & = 0 \\ \\ 48 \text{ ft} \cdot \frac{da}{dt} & = -60 \text{ ft$^2$/s} \\ \\ \frac{da}{dt} & = -1.25 \text{ ft/s} \end{aligned}[/tex]

Since the ladder is sliding down the wall, da/dt is expected to be negative.

In conclusion, the top of the ladder is sliding down at a rate of -1.25 ft/s.

The distance traveled by the echo is used to determine the player's distance from the wall

The player's distance from the wall is 66 m.

Reason:

Known parameter;

The time after which the tennis player hears the echo of the ball, t = 0.4 s

The speed of sound in air, v = 330 m/s

The distance of the player from the wall = Required

Solution:

Let d, represent the distance of the player from the wall

An echo is the reflection the wave of the sound of hitting the ball that

travels to the wall and back

The distance traveled by the sound to the wall, d, and back, (d again), is 2·d

[tex]Speed = \dfrac{Distance}{Time}[/tex]

Therefore;

Therefore;

[tex]330 = \dfrac{2 \cdot d}{0.4}[/tex]

330 × 0.4 = 2·d

[tex]d = \dfrac{330 \times 0.4}{2} = 66[/tex]

Learn more here:

https://brainly.com/question/14754705

9514 1404 393

Answer:

  y = 1/5

Step-by-step explanation:

Divide both sides of the equation by the coefficient of the variable.

  7 = 35y

  7/35 = (35y/35)

  1/5 = 1y

  y = 1/5

_____

A number divided by itself is 1. A number multiplied by 1 is unchanged.

To get from 35y to 1y, or y, divide by 35. That gives you (35/35)y = 1y = y.

Whatever you do to one side of the equation must also be done to the other side. Dividing 7 by 35 gives 7/35 = (7/7)×(1/5) = 1/5.

Answer:

sorry

Step-by-step explanation:

sorry

Answer:

1,219,958

Step-by-step explanation: You add 2+6=8 + 10+3=13 + 19+3=22 + 26+5=31 + 31+1=32 + 5+7=13, add them all and its equal to 1,219,958.

Answer:

pop music of 90

Answer:

[tex]54[/tex]

Step-by-step explanation:

[tex] a_1 {r}^{n - 1} \\ 2 \times {3}^{4 - 1} \\ 2 \times {3}^{3} \\ 2 \times 3 \times 3 \times 3 \\ 2 \times 9 \times 3 \\ 18 \times 3 \\ = 54[/tex]

Hope this helps you.

Let me know if you have any other questions :-):-)

Answer:

pretty sure its A

Step-by-step explanation:

A is the only one with the line going threw -1 and 5

Answer: its A just got done with it

Answer:

$126

Step-by-step explanation:

I divided the figure in 3 parts, 1 triangle and 2 rectangles

found the area of each figure and added all to find the total area

Answer:

the last one is

four cubed plus 8 to the 4th power

4^3 + 8^4

4160

Step-by-step explanation:

Answer:

The answer is letter D 0,6,12,18,24

Step-by-step explanation:

hope it's can help

Answer:

7

Step-by-step explanation:

Pine Street in x miles long.

Maple street is 3 times as long as Pine Street, so Maple street is 3x miles long.

Maple street is 21 miles long.

3x = 21

x = 7

Maple Street is 7 miles long.

Answer:

your answer is c

Step-by-step explanation:

Answer:

Algebra =

X/4 = -5/20

Simplify :

X/4 = -1/4

Of course, Will same x/4 = -1/4

x = -1

Step-by-step explanation:

[tex]\begin{aligned}\tt\frac{x}{4}&=\tt\frac{-5}{20}\\\tt 20x&=\tt -5\times 4\\\tt 20x&=\tt -20\\\tt x&=\tt -1\end{aligned}[/tex]

74  R28

So sorry if its incorrect!

Answer:

look at the explanation 20,440

Step-by-step explanation:

so the invested 2,800 $  and the interest rate is 1.46 so first what I would do is 1.46 times 5 = 7.3 then 7.3 x 2,800 =20,440

so I think the answer is 20,440

not sure if this is correct but I gave it my all

or you could just do 2800 time 5 time 1.46

Answer:

the 5 gallon

67.45 ÷ 5= $13.49

Answer :

square of 5 is 25 .

Answer:

1200

Step-by-step explanation:

Answer:

4.140393356

Step-by-step explanation:

Mean = (3+4+5+7+10+12+15) / 7 = 8

Count = 7 numbers

Sum of the numbers = 56

Each number minus the mean =

(3-8=-5)(4-8=-4)(5-8=-3)(7-8=-1)(10-8=2)(12-8=4)(15-8=7)

Now square of each of these numbers:

25+16+9+1+4+16+49 = 120

Variance = 120/7 = 17.14285714

Standard deviation = square root of the variance

Sqrt 17.14285714 = 4.140393356

Answer:

B. x=4

Step-by-step explanation:

Answer:

The image is blocked

Step-by-step explanation:

Answer:

9990 is the right answer