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Transcript 
Measures of Dispersion
and
The Normal Distribution
Formulas
 x  x 
2
s
n1
standard deviation
The weight (in pounds) of the ten Truly
Amazing Dudes are as follows:
152 196
144 139166
83 186 157140 138
Find the mean and standard deviation of
the weights.
The average (mean) IQ in America is 100 with a
standard deviation of 15. Assume that IQs are normally
distributed.
a. Find the percentage of people with IQ lower than
69.
The average (mean) IQ in America is 100 with a
standard deviation of 15. Assume that IQs are normally
distributed.
b. Find the probability that a person would have an IQ
higher than 106.
The average (mean) IQ in America is 100 with a
standard deviation of 15. Assume that IQs are normally
distributed.
c. Find the percent of people who have an IQ between
69 and 106.
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