Q29 of 46 Page 278

Let x1, x2, ..., xn be n observations and be their arithmetic mean. The formula for the standard deviation is given by

We know, standard deviation for x1, x2, ..., xn observations can be written as

Where is the arithmetic mean

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50, 69, 20, 33, 53, 39, 40, 65, 59


The mean deviation from the median is:

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Let a, b, c, d, e be the observations with mean m and standard deviation s.

The standard deviation of the observations a + k, b + k, c + k, d + k, e + k is