Frequency distribution for the number of errors

Reference no: EM1320089

You are given the following frequency distribution for the number of errors 55 students made in a test:

Errors	Frequency
0-2	14
3-5	13
6-8	1
9-11	8
12-14	9

Find: a. mean b. variance c. standard deviation.

Reference no: EM1320089

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