Determine the population variance and standard deviation for the following
Determine the population variance and standard deviation for the following data by using the original formula.
Class ......... f
20–under 30 ....... 7
30–under 40 ....... 11
40–under 50 ....... 18
50–under 60 ....... 13
60–under 70 ....... 6
70–under 80 ....... 4

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