if my Mean is $7.82, My variance is 0.55, My SD is 0.745 . I need to
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if my Mean is $7.82, My variance is 0.55, My SD is 0.745 . I need to determine the range within which 90% of the prices of cigarettes in my area fall, The chances of anyone paying less than 4 dollars for a pack of cigarettes, and The chances of anyone paying more than 10 dollars for a pack of cigarettes?
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