Q.

Consider the numbers 1 ,2,3, 4, 5, 6,7,8, 9, 10. If 1 is added to each number, then variance of the numbers so obtained is

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a

6.5

b

2.87

c

3.87

d

8.25

answer is D.

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Detailed Solution

We know SD of first 10 natural number is 2.87.Variance =8.24We know that, variance is independent of change oforigin.Hence, after adding 1 on each observation new variancewill same i.e., 8.25
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