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
Nookie1986 [14]
3 years ago
14

Assume that adults have IQ scores that are normally distributed with a mean of 98.8 and a standard deviation 17.1. Find the firs

t quartile Q1​, which is the IQ score separating the bottom​ 25% from the top​ 75%. (Hint: Draw a​ graph.)
Mathematics
1 answer:
noname [10]3 years ago
7 0

Answer:

The  IQ score separating the bottom​ 25% from the top​ 75%. is 87.3

Step-by-step explanation:

Given that adults have IQ scores that are normally distributed with a mean of 98.8 and a standard deviation 17.1.

To find the first quartile, we calculate X such that P(X<z)=0.25.

From the normal distribution table the The z-value that corresponds to an area of 0.25 is z=-0.675

We  use the formula:

z=\frac{X-\mu}{\sigma}

We substitute to get:

-0.675=\frac{X-98.8}{17.1}

This implies that:

17.1*-0.675=X-098.8

-11.5425=X-098.8

Solve for x to get:

x=98.8-11.5425

X=87.2575

You might be interested in
Help please!!!!!!!!!!!!!!!
anygoal [31]
-1. hope that helps!
3 0
3 years ago
Darlene was asked to identify which of the following numbers is prime. Witch number should she choose
nordsb [41]
3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191 those are some prime numbers :)
5 0
3 years ago
र<br> Solve the equation<br> y + 3 = -y + 9<br> O y= 1<br> O y=3<br> O y=6<br> O y=9<br> र
Leto [7]

Answer:

y=3

Step-by-step explanation:

y + 3 = -y + 9

y + y = 9 - 3

2*y = 6

y = 6/2

y = 3

6 0
2 years ago
Read 2 more answers
(2x – 5y) and (x + y)?
Firdavs [7]
3x-6y. you need to take away the parentheses and combine like terms

4 0
3 years ago
Mai's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Mai $4.10 per pound, and type B co
velikii [3]
About 49 pounds

$5.75 x 2 = 11.50

561.60 / 11.50 = 48.83 (round)
49 lbs
7 0
2 years ago
Other questions:
  • What is the answer to the question 25% of what is 21?
    9·2 answers
  • If you wanted to write a word problem about how much money the fourth-grade class
    6·1 answer
  • What are the multiples of 7 up to 35
    6·1 answer
  • Help me please I done understand
    9·1 answer
  • You want to buy a pizza with 2 toppings. The restaurant offers five possible toppings. How many ways can you choose 2 toppings?
    5·1 answer
  • Only one question .Who knows about this plz "Find the measures indicated. round to the nearest tenth".​
    15·2 answers
  • In a certain​ four-engine vintage​ aircraft, now quite​ unreliable, each engine has a 15​% chance of failure on any​ flight, as
    5·1 answer
  • What is the image of (2,3)(2,3) after a reflection over the line y=-xy=−x?
    8·2 answers
  • Divide 81 ft in the ratio 5 :4
    12·2 answers
  • 3.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!