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is there any help for the following question involving standard deviation A major department store has determined that its customers charge an average of $500

is there any help for the following question involving standard deviation

A major department store has determined that its customers charge an average of $500 per month, with a standard deviation of $80. Assume the amounts of charges are normally distributed.

(a) What percentage of customers charges more than $390 per month?

(b)What percentage of customers charges between $650 and $700 per month?

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