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A local bank has determined that the daily balances of the checking accounts of its customers...

A local bank has determined that the daily balances of the checking accounts of its customers are normally distributed with an average of $280 and a standard deviation of $20. [1] What percentage of its customers has daily balances of more than $275? [1] What percentage of its customers has daily balances less than $243? [2] What percentage of its customers' balances is between $241 and $301.60?

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