Question

- The mean of a normally distributed data set is 112, and the
standard deviation is 18.

a) Use the**Empirical Rule**to find the probability that a randomly-selected data value is greater than 130.

b) Use the**Empirical Rule**to find the probability that a randomly-selected data value is greater than 148.

- A psychologist wants to estimate the proportion of people in a
population with IQ scores between 85 and 130. The IQ scores of this
population are normally distributed with a mean of 100 and a
standard deviation of 15. Use the
**Empirical Rule**to estimate the proportion.

- The mean of a normally distributed data set is 112, and the
standard deviation is 18.

a) Use the**standard normal table**to find the probability that a randomly-selected data value is greater than 130.

b) Use the**standard normal table**to find the probability that a randomly-selected data value is greater than 148.

- A psychologist wants to estimate the proportion of people in a
population with IQ scores between 85 and 130. The IQ scores of this
population are normally distributed with a mean of 100 and a
standard deviation of 15. Use the
**standard normal table**to estimate the proportion.

- Why are your answers to questions 8 and 9 not identical to your
answers to questions 6 and 7, respectively?

- The mean of a normally distributed data set is 112, and the
standard deviation is 18.

a) Use the**standard normal table**to find the probability that a randomly-selected data value is greater than 110.

b) Use the**standard normal table**to find the probability that a randomly-selected data value is less than 100.

Answer #1

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 normally distributed with a mean of 101 and a
standard deviation of 12. Using the empirical rule, what percent of
people have an IQ greater than 125?

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 taht are normally distributed
with a mean of 96.2 standard deviation of 22.1. Find the
probability that a randomly selected adult has a IQ greater than
131.8

Assume that adults have IQ scores that are normally distributed
with a mean of 103.3 and a standard deviation of 16.2. Find the
probability that a randomly selected adult has an IQ greater than
127.4. (Hint: Draw a graph.) The probability that a randomly
selected adult from this group has an IQ greater than 127.4 is

Assume that adults have IQ scores that are normally distributed
with a mean of 102.9 and a standard deviation of 15.1 Find the
probability that a randomly selected adult has an IQ greater than
119.8

Assume that adults have IQ scores that are normally distributed
with a mean of 104.1 and a standard deviation of 23.6 Find the
probability that a randomly selected adult has an IQ greater than
144.3

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?

a normally distributed data set has a mean of 150 and a standard
deviation of 30 determine the probability that randomly selected
x-value between 100 and 175
(2 pt)A normally distributed set of data has a mean of 60 and a
standard deviation of 10 Determine the probability that a randomly
selected x-value is a. at least 45 and b. at most 66.

A normally distributed population has a mean of
560
and a standard deviation of
60
.
a. Determine the probability that a random sample of size
25
selected from this population will have a sample mean less
than
519
.
b. Determine the probability that a random sample of size
16
selected from the population will have a sample mean greater
than or equal to
589
Although either technology or the standard normal distribution
table could be used to find...

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