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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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