Calculate the standard deviation by direct method — task. Maths TNSB Mentoring, Class 10.

The number of mobiles sold by the shop keeper from Monday to Friday are correspondingly as follows:

5, 6, 6, 8, 9

Find its standard deviation.

Answer:

The standard deviation \(=\)

[Note: Enter the answer rounded to two decimal places.]

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7. Calculate the standard deviation by direct method