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The mean of a normal probability distribution is 400; the standard deviation is 10. a. About 68% of the observations lie between what two values?

The mean of a normal probability distribution is 400; the standard deviation is 10.

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


Value 1
Value 2

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


Value 1
Value 2

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


Value 1
Value 2

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