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Consider the following frequency distribution Class Frequency 50 up

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.

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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