Question

- For the following, consider that IQ scores are normally
distributed with a mean of 100 and a standard deviation of 15.
- Find the probability that a person has an IQ below 60

- Find the probability that a randomly selected person has an IQ between 60 and 85

- Find the probability that a randomly selected person has an IQ above 118.

- Find the IQ score that cuts off the lower 25% of the population
from the upper 75%.

- Find the probability that 10 people will have a mean IQ below 80?

Answer #1

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...

IQ scores are normally distributed
with mean of 100 and a standard deviation of 15.
If MENSA only accepts people with an IQ score at the
99th percentile or higher, what is the lowest possible
IQ score you can have and still be admitted to the
organization?
Mental disability has traditionally been diagnosed for anyone
with an IQ of 70 or lower. By this standard, what proportion of the
population would meet criteria to be diagnosed with a mental
disability?...

According to an article in American Scientist, IQ scores are
normally distributed with a mean of 100 and a standard deviation of
15. Find the following probabilities:
a) The probability that a randomly selected person has an IQ
score of at least 111.
b) The probability that a randomly selected person has an IQ of
less than 96.
c) The probability that a randomly selected person has an IQ
score between 119 and 145.
(Please show all work.)

IQ scores are normally distributed with a mean of 110 and a
standard deviation of 16. Find the probability a randomly selected
person has an IQ score greater than 115.

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...

Suppose scores on an
IQ test are normally distributed. If the test has a mean of 100 and
a standard deviation of 10.
1. What is the
probability that a person who is randomly selected will score
between 83 and 102?
2. What is the
probability that a person who is randomly selected will score more
than 119?
3. What IQ score
corresponds to the 83rd percentile for all people?

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...

1. IQ tests are normally distributed with a mean of 100 and a
standard deviation of 15. Find the following probabilities:
A) If a person is randomly selected, what is the probability
that the person had an IQ greater than125? _________________
b) If a person is randomly selected what is the probability that
the person has an IQ below 92?
c) If 40 people are randomly selected, what is the probability
that their mean IQ is between 98 and 108?

Assume that adults have IQ scores that are normally distributed
with a mean of 100 and a standard deviation of 15. For a randomly
selected adult, find the probability. Round scores to nearest whole
number.
1.) Prob. of IQ less than 85
2.)Prob. of IQ greater than 70
3.) Prob. of randomly selected adult having IQ between 90 and
110.

Assume that adults have IQ scores that are normally distributed
with a mean of mu equals 100 and a standard deviation sigma equals
20. Find the probability that a randomly selected adult has an IQ
between 85 and 115. The probability that a randomly selected adult
has an IQ between 85 and 115 is:

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