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
raketka [301]
3 years ago
8

Assume that adults have IQ scores that are normally distributed with a mean of 101.3 and a standard deviation 19.9. Find the fir

st quartile Upper Q 1​, which is the IQ score separating the bottom​ 25% from the top​ 75%. (Hint: Draw a​ graph.)

Mathematics
1 answer:
AnnyKZ [126]3 years ago
4 0

Answer:

87.9

Step-by-step explanation:

Use a calculator or table to find the z-score that corresponds to 25%.

P(Z < z) = 0.25

z = -0.675

Now find the value that corresponds to that z score.

z = (x − μ) / σ

-0.675 = (x − 101.3) / 19.9

x = 87.9

You might be interested in
Solve for W
umka2103 [35]

In this equation w = -1.1

In order to find this, get all w values to the right side and all numbers to the left side.

-2.27 + 9.1w + 1.3w = -3.4w - 17.45 ----> combine like terms

-2.27 + 10.4w = -3.4w - 17.45 ----> add 3.4w to both sides

-2.27 + 13.8w = -17.45 ----> add 2.27 to both sides

13.8w = -15.18 -----> divide both sides by 13.8

w = -1.1

4 0
3 years ago
Read 2 more answers
A rectangle with an area of 103 square feet is dilated by a scale factor of 3. What is the new area?
nekit [7.7K]
Okay so a dilation means that you would multiply the area by your scale factor. 103 times 3 is 309. Your answer is 309
8 0
3 years ago
The cooking class used 18 cups of flour to make 8 identical loaves of bread. How many cups of flour were needed for each loaf ?
Bas_tet [7]
What we need to do is divide 18 by 8 because 18 cups of flour makes 8 loaves of bread. By using a calculator, 18/8 = 2 1/4.
4 0
2 years ago
How much is a 12cm pencil than a 1mm pen
insens350 [35]
2 mm longer hope helps
7 0
3 years ago
Please help me on this one I’m stuck
crimeas [40]
14
hoped this helped ☺
7 0
3 years ago
Other questions:
  • PLEASE PLEASE HELP!! I'm a bit behind with math, and you'd be doing me a huge huge favor! thank you so much in advance. (:
    5·2 answers
  • The company, hewerrtt, would like to make letter codes using all of the letters in the word hewerrtt. how many codes can be made
    5·2 answers
  • Which addition property is demonstrated by this problem?<br><br> 23 + (4 + 3) = (23 + 4) + 3
    10·1 answer
  • Ariana has $1.40 worth of nickels and dimes. She has twice as many nickels as dimes. Determine the number of nickels and the num
    12·1 answer
  • Round the following number to the indicated place value.
    5·2 answers
  • What is the quotient and remainder for 52 divided by 8
    15·1 answer
  • Mr. Littles is building a triangular sandbox using three boards. He already has two boards that measure 9 feet and 12 feet. Sele
    6·1 answer
  • Find b and c so that y =<br> 2x^2 + bx+c has vertex (0,-2)<br> b=<br> C=
    15·1 answer
  • HELP PLEASE :(... I will give brainliest:)
    13·1 answer
  • The first three terms of an arithmetic sequence are as follows. 17,25 , 33 Find the next two terms of this sequence.
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!