1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
DanielleElmas [232]
3 years ago
7

Iq scores are normally distributed with a mean of 100 and a standard deviation of 15.

Mathematics
1 answer:
bearhunter [10]3 years ago
6 0

Mean is \mu=100 and a standard deviation is \sigma =15, then the variable X\sim N(100,15^2).

Use substitution

Z=\dfrac{X-\mu}{\sigma},\\  \\ Z=\dfrac{X-100}{15}.

This substitution gives you that Z\sim N(0,1).

a. For X=130, Z=\dfrac{130-100}{15}=2 and Pr(X>130)=Pr(Z>2) =0.9772 (the decimal value is taken from the Standard Normal Distribution Table).

b. For X=90, Z=\dfrac{90-100}{15}=-\dfrac{2}{3} and for X=110, Z=\dfrac{110-100}{15}=\dfrac{2}{3}. Then Pr(90 (the decimal value is taken from the Standard Normal Distribution Table).

You might be interested in
Do you need help with geometry?? Let me help<br> send me your questions and i will help you!
Vlad [161]

Answer:

I dont have a question but thanks so much for doing that!

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Can anyone just tell me how to do this please
Brums [2.3K]
Ik how you  feel not sure how to do it either stilll a beginer on here myself 

8 0
3 years ago
Line / is parallel to line m. The slope of line / is 2/7. What is the slope of line M ?
Ray Of Light [21]

Answer:

The slope would also be 2/7.

Step-by-step explanation:

The two lines are parallel, meaning that they follow the same slope. If line / has a slope of 2/7, then line M must have the same slope as well. I hope this helps! :)

6 0
2 years ago
Please help with this question!
mart [117]

Answer:

($4.00/x)+($4.50/y)

Step-by-step explanation:

we know that

Apples cost 80 cents for x apples

so

One apple cost $0.80/x

Oranges cost 75 cents for y oranges

so

One orange cost $0.75/y

Find the cost of 5 apples and 6 oranges

Multiply the number of apples by the cost of one apple and multiply the number of oranges by the cost of one orange

so

5($0.80/x)+6($0.75/y)=($4.00/x)+($4.50/y)

7 0
3 years ago
In the diagram, the measure of angle 5 is (10x -9), and the measure of angle 7 is (9x). What is the measure of angle 6, to
Andre45 [30]

Answer:

The answer is option C, or 99 degrees

Explanation:

Hi there!

(next time, a picture of the graph would've been helpful)

The answer is 99 degree angle or C on E d g e n u i t y

Have a wonderful rest of your day!!

P.S. super sorry I was late, I just took the test today \(^u^\)

3 0
3 years ago
Other questions:
  • Jordan makes 100 3-point shots per basketball practice. She makes 44 of these shots. What decimal represents the number of the s
    10·2 answers
  • What is the length of segment CD question mark
    8·1 answer
  • Solve the equation. <br><br> -1/3 + w = 5 3/8<br><br> what is w
    15·1 answer
  • I am donating packages for Christmas drive. After the first week, I spent 126 to donate three children packages and 8 adult pack
    14·1 answer
  • Samuel has a collection of toy cars. His favorites are the 27 red ones which make up 60 % of his collection.How many toy cars do
    10·2 answers
  • Vassil rounded to the nearest half to estimate the product of Five-eighths and StartFraction 8 over 9 EndFraction. How do the es
    12·2 answers
  • The first 2 terms of an ap is -2 and 3 how many terms are needed for the sum to be equal to 306 ​
    10·1 answer
  • I need help on question b please it hard
    9·1 answer
  • 3x-7y=9, x=-2,0,2 <br> When x=2, the value of y is
    7·1 answer
  • What is 11.25 x 34.67 + 34.67 divided by 2?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!