Question

IQ scores are Normally distributed with mean 100 and standard deviation 15. Please show working

1- Find the probability that an IQ result is between 75 and 95.

2- Find the probability of having an IQ greater than 120.

3- how high would you IQ have to be to be in the top 2% of all IQ results.

Answer #1

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%

13. Adult IQ scores are normally distributed with a mean of 100
and a standard deviation of 15. Find the probability that a
randomly chosen adult has an IQ between 70 and 115.

IQ
scores are normally distributed with a mean of 100 and a standard
deviation of 15. Determine the 90th percentile for IQ scores

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 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.

IQ
scores are normally distributed with a mean of 100 and standard
deviation 15. what is the IQ score for an area of 0.9918

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...

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?...

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...

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?

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