Assume that a set of test scores is normally distributed with a mean
Assume that a set of test scores is normally distributed with a mean
of 120 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities.
The percentage of scores less than 120 is?
The percentage of scores greater than 140 is?
The percentage of scores between 80 and 140 is?
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