Question

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability that a randomly selected adult has an IQ between 115 and 130.

(a) .6700 (b) .1359 (c) .9082 (d) .1596 (e) .1628

5 Refer to question 4
above. Find the IQ score at Q1 or the 25^{th} percentile.
This is the score which separates the bottom 25% from the top
75%.

(a) 89.95 (b) 110.05 (c) 84.95 (d) .2514 (e) .7486

6 Refer to question 4
above. Find the IQ score at Q2 or the 50^{th} percentile.
This is the score which separates the top 50% from the bottom
50%.

(a) 103 (b) 110.05 (c) 0.00 (d) 100 (e) .5000

Answer #1

Ans 4

Ans 5

a) 89.887

Ans 6

d)

100

Adults have a IQ scores that are normally distributed with a
mean of a 100 and a standard deviation of 15.
a) what percentage of scores are less than 103?
b) what percentage of scores are between 60 and 130?
c) what is the IQ score seperating the bottom 25% from the
rest?
thank you.

adults have IQ scores that are normally distributed with a mean of
100 and a standard deviation of 15
a. what IQ score respresents the 95th percentile?
b. what IQ score represents the 50th percentile?
show how you got the answer step by step, clearly just trying
to check my work thanks !

A) Assume that adults have IQ scores that are normally
distributed with a mean of 100 and a standard deviation of 15. Find
the probability that a randomly selected adult has an IQ between 90
and 120. (Provide graphing calculator sequence)
B) Assume that adults have IQ scores that are normally
distributed with a mean of 100 and a standard of 15. Find P3D,
which is the IQ score separating the bottom 30% from the top 70%.
(Provide graphing calculator...

Suppose the distribution of IQ scores of adults is normal with a
mean of 100 and a standard deviation of 15. Find IQ score that
separates the top 32 percent of adult IQ scores from the bottom 68
percent. Round your answer to the nearest integer. The IQ score
that separates the top 32 percent of adult IQ scores from the
bottom 68 percent is [IQValue].

6. Assume that adults have IQ scores that are normally
distributed with mean 100 and standard deviation 15. In each case,
draw the graph (optional), then find the probability of the given
scores. ROUND YOUR ANSWERS TO 4 DECIMAL PLACES
a. Find the probability of selecting a subject whose score is
less than 115. __________
b. Find the probability of selecting a subject whose score is
greater than 131.5. __________
c. Find the probability of selecting a subject whose score...

IQ test scores are normally distributed with a mean of 100 and a
standard deviation of 15.
a) Find the IQ scores that represent the bottom 35%
. b) Find the IQ score that represents the 3rd Quartile
c) Find the IQ score for the top 5%

7. IQ scores are normally distributed with a mean of 100 and a
standard deviation of 15 points.
a. Find the probability that a randomly selected person has an
IQ less than 115.
b. Find the probability that a randomly selected person has an
IQ above 60.
c. Find the 80th percentile for IQ scores.
d. Find the probability that 20 randomly selected person has an
IQ less than 110.
e. What percentage of people have IQ scores between 60...

Assume that adults have IQ scores that are normally distributed
with a mean of 96.3 and a standard deviation 23.1 Find the first
quartile , which is the IQ score separating the bottom 25% from
the top 75%. (Hint: Draw a graph.)

Assume that adults have IQ scores that are normally distributed
with a mean of 101 and a standard deviation 24. Find the first
quartile Upper Q 1, which is the IQ score separating the bottom
25% from the top 75%.

Assume that adults have IQ scores that are normally distributed
with a mean 105 and standard deviation of 20. a. Find the
probability that a randomly selected adult has an IQ less than 120.
b. Find P90 , which is the IQ score separating the bottom 90% from
the top 10%. show work

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