Asked by Latina

The mean of a normal probability distribution is 440; the standard deviation is 8.

A: About 95% of the observations lie between what two values?
B: Practically all of the observations lie between what to values?

Answers

Answered by R_scott
A: 2 s.d. below and 2 s.d. above the mean
... [440 - (2 * 8)] and [440 + (2 * 8)]

B: 3 s.d. below and 3 s.d. above the mean
... [440 - (3 * 8)] and [440 + (3 * 8)]
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