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A major department store has determined that its customers charge an average of $600 per month, with a standard deviation of $120. Assume the amounts
A major department store has determined that its customers charge an average of $600 per month, with a standard deviation of $120. Assume the amounts of charges are normally distributed.
(a) | What percentage of customers charges more than $460 per month? |
(b) | What percentage of customers charges between $620 and $700 per month? |
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