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 top100100 issuers.

Credit Card Rate	Frequency
18%-23%18%-23%	1111
17%-17.9%17%-17.9%	1313
16%-16.9%16%-16.9%	3333
15%-15.9%15%-15.9%	1717
14%-14.9%14%-14.9%	2626

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Step2of2:

Calculate the standard deviation of the credit card rate charged by the top100100 issuers based on the frequency distribution. Round your answer to two decimal places.