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I need some help A major department store has determined that its customers charge an average...

I need some help

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 $490 per month?

(b)

What percentage of customers charges between $660 and $700 per month?
math   Statistics-And-Probability   
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