An IQ test is designed so that the mean is 100 and the standard deviation is 21 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with ​99% confidence that the sample mean is within 6 IQ points of the true mean. Assume that σ=21 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation.

Answer: B

Step-by-step explanation:

The pair of equations that can be used to find x and y are:

x + y = 62

(1.02)x = 7

An equation is a  mathematical statement that is made up of two expressions connected by an equal sign.  In its simplest form in algebra, the definition of an equation is a mathematical statement that shows that two mathematical expressions are equal.

Here, we have,

The form of the pair of equations would be:

hours worked last week + hours worked this week = total hours worked both weeks equation 1

(1 + percent increase/100) x hours worked last week = hours worked this week equation 2

x + y = 62 equation 1

(1 + 20/100) ×x = y

(1.02)x = 7 equation 2

The two equations can be solved using either of these three methods:

elimination method

substitution method

graph method

To learn more about mathematical equations, please check: brainly.com/question/26427570

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complete question:

Jillian worked 62 hours this week and last week. She worked x hours last week and y hours this week. She worked 20% more hours this week than last week. What pair of equations can be used to find x and y?

Answer: 1/16

Step-by-step explanation:

total number of letters in word =16

probability of p=?

in given words p is only used one time so

1/16 is the probability

Answer:

668.17

Step-by-step explanation:

Answer:

I believe the answer is=2x2+342.

Answer:

okay I would say 1/4

Step-by-step explanation:

the originally eight letters, and then you take one out so there's seven and then your chances of getting the I are two so that's 2/7. then there's only one consonant the R so 1/4.

Answer:

-a+11

Step-by-step explanation:

hard to explain. but should be correct

Answer: (4, 3)

Step-by-step explanation:

Let's use substitution.

So for y in the first equation we will substitute the expression for y in the second.

2x - 3(x-1) =  -1

2x -3x + 3 = -1

-1x + 3 = -1

       -3    -3

-1x = -4

-1x / -1 = -4 / -1

x = 4

Now plug in x for the second equation

y = 4 - 1

y = 3

Now check it using the first equation:

2(4) - 3(3) = -1

8 - 9 = -1

-1 = -1

It's true so it's correct

Answer: 5 1/2

Step-by-step explanation:

You keep your whole number which is five, then you see that the other 5 is in the tenths place in the decimal (5.5) so you put 5 over 10 and combine the fraction (5/10) with the whole number (5) and that is 5 5/10. But you see that it is not simplified so you simplify and get 5 1/2. I hope this helps :)

Answer:

Step-by-step explanation:

Answer:

7/100

Step-by-step explanation:

two decimal places so 100

Answer:

9 = x^2+y^2

Step-by-step explanation:

3^2 = (x-0)^2 + (y-0)^2

9 = x^2+y^2

Answer:

line 2

Step-by-step explanation:

on line 2 the two minuses at the end turn into a + (where the -2 is there should be a +2) because - x - = +

Answer:

Step-by-step explanation:

I would take his phone for a bit and also reduce screen time to 6 hours a week at MOST. It would help a lot.

Answer:

a_3=4

Step-by-step explanation:

a1 = 100

r = 1/5

an = 100 (1/5)^(n - 1)

so we now have the answer for a_3

a_3 = 100 * (1/5)^(3 - 1)

a_3 = 100 * (1/5)^2

a_3 = 100 * 1/25

a_3 = 4  

i believe this is it, although i'm not entirely sure

good luck :)

**please let me know if this was wrong/not what you were looking for or both**

have a nice day!

Answer:

[tex] {x}^{2} + 14x + 13 \\ (x + 13)(x + 1)[/tex]

Step-by-step explanation:

I hope that is useful for you :)

Answer:

Step-by-step explanation:

Answer:

6

Step-by-step explanation:

I found that the greatest common factor for those numbers is 6

Answer

C

Step-by-step explanation:

Answer:

2.02 may be I thinks tell me if it's right

Answer:

17000

Step-by-step explanation:

I hope this helps:)

Answer:

the equation for that line would be y=0

Step-by-step explanation:

The slope is 0 so if one were to plug in 0 as a slope to y=mx+b you would get y=0x which can be simplified to y=0. Hope this helped. :)

Answer:

Not enough information.

Step-by-step explanation:

Answer:

C closed

Step-by-step explanation:

Answer:

1 yard=3 feet

Step-by-step explanation:

If it needs more, then 3 feet=36in.

Answer:

That would be 9 my good sir ( or ma'am )

Step-by-step explanation:

basicly round the 61 so that there would not be a remainder and divide 54 by 6 you will get 9, so therefore the same case is for 540 by 60.

Have a nice day

Answer:

44x + 54

Step-by-step explanation:

The nth term of an arithmetic sequence is given by :

Tn = a + (n - 1)d

d = common difference = T2 - T1

d = T2 - T1

a = first term = - x + 9

d = 4x + 14 - (-x + 9)

d = 4x + 14 + x - 9

d = 5x + 5

The 10th term:

T(10) = (-x + 9) + (10 - 1)*(5x + 5)

T(10) = - x + 9 + 9(5x + 5)

T(10) = - x + 9 + 45x + 45

T(10) = 44x + 54

Hence, the 10th term is 44x + 54

Answer:

y = 8 !!! hope this helps !!

Step-by-step explanation:

Answer:Step-by-step explanation:

x+46=90

x=90-46

x=44°