An article in Business Week discussed the large spread between the federal funds rate and the average credit card rate. The table below is a frequency distribution of the credit card rate charged by the top100 issuers.

Credit Card Rate	Frequency
18%-23%	19
17%-17.9%	16
16%-16.9%	31
15%-15.9%	26
14%-14.9%	8

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Step2of2:

Calculate the standard deviation of the credit card rate charged by the top100 issuers based on the frequency distribution. Round your answer to two decimal places.