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The Webster National Bank is reviewing its service charge and interest-paying policies on checking accounts. The bank has found that the average daily balance on personal checking accounts is $550, with a standard deviation of $150. In addition, the average daily balances have been found to be normally distributed (Gaussian).
(a) What percentage of personal checking account customers carry average daily balances in excess of $800?(b) What percentage of the bank's customers carries average daily balances below of $200?(c) What percentage of the bank's customers carries average daily balances between $300 and $700?(d) The bank is considering paying interest to customers carrying average daily balances in excess of a certain amount. If the bank does not want to pay interest to more than 5% of its customers, what is the minimum average daily balance it should be willing to pay interest on?
Can you please describe what I need to do to complete this? I do not understand how to plot the figures within the spreadsheet or calculate them.
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