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The mean of a normal probability distribution is 320; the standard deviation is 18. a)About 68% of the observations lie between what two values? b)About

The mean of a normal probability distribution is 320; the standard deviation is 18.

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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