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The mean of a normal probability distribution is 440; the standard deviation is 8. a. About 68% of the observations lie between what two values?

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

a. About 68% of the observations lie between what two values?

b. About 95% of the observations lie between what two values?

c. Practically all of the observations lie between what two values?

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