Question

On a planet far far away from Earth, IQ of the ruling species is
normally distributed with a mean of 105 and a standard deviation of
15. Suppose one individual is randomly chosen. Let X = IQ of an
individual.

a. What is the distribution of X? X ~ N(,)

b. Find the probability that a randomly selected person's IQ is
over 87. **Round your answer to 4 decimal
places.**

c. A school offers special services for all children in the bottom
7% for IQ scores. What is the highest IQ score a child can have and
still receive special services? **Round your answer to 2
decimal places.**

d. Find the Inter Quartile Range (IQR) for IQ scores. **Round
your answers to 2 decimal places.**

Q1:

Q3:

IQR:

Answer #1

On a planet far far away from Earth, IQ of the ruling species is
normally distributed with a mean of 101 and a standard deviation of
14. Suppose one individual is randomly chosen. Let X = IQ of an
individual.
a. What is the distribution of X? X ~ N(,)
b. Find the probability that a randomly selected person's IQ is
over 75. Round your answer to 4 decimal
places.
c. A school offers special services for all children in the...

On a planet far far away from Earth, IQ of the ruling species is
normally distributed with a mean of 119 and a standard deviation of
18. Suppose one individual is randomly chosen. Let X = IQ of an
individual.
a. What is the distribution of X? X ~ N(,)
b. Find the probability that a randomly selected person's IQ is
over 104. Round your answer to 4 decimal
places.
c. A school offers special services for all children in the...

On a planet far far away from Earth, IQ of the ruling species is
normally distributed with a mean of 107 and a standard deviation of
18. Suppose one individual is randomly chosen. Let X = IQ of an
individual.
a. What is the distribution of X? X ~ N(,)
b. Find the probability that a randomly selected person's IQ is
over 116. Round your answer to 4 decimal
places.
c. A school offers special services for all children in the...

On a planet far far away from Earth, IQ of the ruling species is
normally distributed with a mean of 120 and a standard deviation of
15. Suppose one individual is randomly chosen. Let X = IQ of an
individual.
a. What is the distribution of X? X ~ N(,)
b. Find the probability that a randomly selected person's IQ is
over 107. Round your answer to 4 decimal
places.
c. A school offers special services for all children in the...

On a planet far far away from Earth, IQ of the ruling species is
normally distributed with a mean of 110 and a standard deviation of
17. Suppose one individual is randomly chosen. Let X = IQ of an
individual. a. What is the distribution of X? X ~ N( , ) b. Find
the probability that a randomly selected person's IQ is over 119.
Round your answer to 4 decimal places. c. A school offers special
services for all...

The amount of time that people spend at Grover Hot Springs is
normally distributed with a mean of 74 minutes and a standard
deviation of 14 minutes. Suppose one person at the hot springs is
randomly chosen. Let X = the amount of time that person spent at
Grover Hot Springs . Round all answers to 4 decimal places where
possible.
a. What is the distribution of X? X ~ N( , )
b. Find the probability that a randomly...

IQ scores are known to be normally distributed with a mean of
100 and a standard deviation of 16.
a. Determine the percentage of students who score between 85 and
120.
b. Determine the percentage of students who score 80 or
greater.
c. Obtain the quartiles, Q1, Q2, and Q3 for the IQ scores, and
show this on a sketch of a normal curve. Include both a z-axis and
an x-axis below the curve.
d. If Mensa only accepts the...

Assume that adults have IQ scores that are normally distributed
with a mean of mu equals 105 and a standard deviation sigma equals
20. Find the probability that a randomly selected adult has an IQ
less than 129. Click to view page 1 of the table. LOADING... Click
to view page 2 of the table. LOADING... The probability that a
randomly selected adult has an IQ less than 129 is nothing. ?(Type
an integer or decimal rounded to four decimal...

Assume that adults have IQ scores that are normally distributed
with a mean of 101.9 and a standard deviation of 23.9.
Find the probability that a randomly selected adult has an IQ
greater than 149.6
(Hint: Draw a graph.) (Round to four decimal places as
needed.)

Assume that adults have IQ scores that are normally distributed
with a mean of 99.9 and a standard deviation of 15.5. Find the
probability that a randomly selected adult has an IQ greater than
125.3. (Hint: Draw a graph.)
The probability that a randomly selected adult from this group has
an IQ greater than 125.3 is
nothing.
(Round to four decimal places as needed.)

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