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A major credit card company has determined that its customers charge an average of $280 per...

A major credit card company has determined that its customers charge an average of $280 per month on their accounts with a standard deviation of $20.

a. What percentage of the customers charges more than $275 per month?
b. What percentage of the customers charges less than $243 per month?
c. What percentage of the customers charges between $241 and $301.60 per month?
Math   Statistics-And-Probability   
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