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 $380 per month?
b. What percentage of customers charges less than $340 per month?
c. What percentage of customers charges between $644 and $700 per month?
a. 93.32%
b. 2.28%
c. 2.97%
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