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The mean of a normal probability distribution is 400; the standard deviation is 18. a. About 68% of the observations lie between what two values?

The mean of a normal probability distribution is 400; 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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