Calculate the standard deviation of the sample of calls

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Reference no: EM133163522

Question - The table that you will find at the end of the exercise corresponds to the duration of a sample of telephone calls (in minutes).

Classes

Frequency

2-4

2

5-7

6

8-10

7

A) Calculate the standard deviation of the sample of calls

B) Determine the interval between 2 standard deviations.

C) If the distribution is skewed, what percentage of the values ??are expected to fall within 2 standard deviations?

Reference no: EM133163522

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