Question: The mean of a normal probability distribution is 500; the standard deviation is 10. a. About 68% of the observations lie between what two values?

The mean of a normal probability distribution is 500; the standard deviation is 10.
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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