Question: Consider the following frequency distribution. Class ....... Frequency 50 up to 60 .... 10 60 up to 70 .... 15 70 up to 80 .....

Consider the following frequency distribution.
Class ....... Frequency
50 up to 60 .... 10
60 up to 70 .... 15
70 up to 80 ..... 8
80 up to 100 .... 2

a. Calculate the sample mean.
b. Calculate the sample variance and the sample standard deviation.

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