Question

Assume that adults have IQ scores that are normally distributed with a mean of

97.8

and a standard deviation

21.2

Find the first quartile

Upper Q 1

which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.)

The first quartile is

(Type an integer or decimal rounded to one decimal place as needed.)

Answer #1

Given that, mean (μ) = 97.8 and

standard deviation = 21.2

X ~ N(97.8, 21.2)

We want to find, the value of x such that, P(X < x) = 0.25

First we find, the z-score such that, P(Z < z) = 0.25

Using standard normal z-table we get, z-score corresponding probability of 0.25 is z = -0.67

Therefore, the first quartile is **83.6**

Assume that adults have IQ scores that are normally distributed
with a mean of 100.5 and a standard deviation 20.5. Find the first
quartile Upper Q 1, which is the IQ score separating the bottom
25% from the top 75%. (Hint: Draw a graph.) The first quartile is
nothing. (Type an integer or decimal rounded to one decimal place
as needed.)

Assume that adults have IQ scores that are normally distributed
with a mean of
104.4104.4
and a standard deviation
19.319.3.
Find the first quartile
Upper Q 1Q1,
which is the IQ score separating the bottom 25% from the top
75%. (Hint: Draw a graph.)
The first quartile is
nothing.
(Type an integer or decimal rounded to one decimal place as
needed.)

Assume that adults have IQ scores that are normally distributed
with a mean of
100.7100.7
and a standard deviation
19.419.4.
Find the first quartile
Upper Q 1Q1,
which is the IQ score separating the bottom 25% from the top
75%. (Hint: Draw a graph.)
The first quartile is
nothing.
(Type an integer or decimal rounded to one decimal place as
needed.)

Assume that adults have IQ scores that are normally distributed
with a mean of 101.1 and a standard deviation 17.8. Find the first
quartile Upper Q 1, which is the IQ score separating the bottom
25% from the top 75%. (Hint: Draw a graph.)
The first quartile=
In good detail plz
(Type an integer or decimal rounded to one decimal place as
needed.)

Assume that adults have IQ scores that are normally distributed
with a mean of 101.2 and a standard deviation 23.6 Find the first
quartile Upper Q 1Q1, which is the IQ score separating the bottom
25% from the top 75%. (Hint: Draw a graph.) The first quartile
is

Assume that adults have IQ scores that are normally distributed
with a mean of
102.7
and a standard deviation
20.9
Find the first quartile
Upper Q 1
which is the IQ score separating the bottom 25% from the top
75%. (Hint: Draw a graph.)
The first quartile is?

Assume that adults have IQ scores that are normally distributed
with a mean of 103.9 and a standard deviation 24.9. Find the first
quartile Upper Q 1, which is the IQ score separating the bottom
25% from the top 75%. (Hint: Draw a graph.) The first
quartile

Assume that adults have IQ scores that are normally distributed
with a mean of 102.5 and a standard deviation 15.7. Find the first
quartile Upper Q 1, which is the IQ score separating the bottom
25% from the top 75%. (Hint: Draw a graph.)
The first quartile is

Assume that adults have IQ scores that are normally distributed
with a mean of 96.2 and a standard deviation 19.2. Find the first
quartile Upper Q 1, 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 95.7 and a standard deviation 21.7. Find the first
quartile Upper Q 1, which is the IQ score separating the bottom
25% from the top 75%. (Hint: Draw a graph.)

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