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Statement of a problem № m850

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SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Estimate the mean and the standard deviation. Age (years) Frequency 10 up to 20......... 3 20 up to 30......... 7 30 up to 40......... 18 40 up to 50 ......... 20 50 up to 60......... 12




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