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If a variable X takes values 1,2,3,4...........,n with frequencies nC0 , nC1 ,nC2 , ................. nCn , then write the variance of X. Please give detailed steps thanks in advance .

If a variable X takes values 1,2,3,4...........,n with frequencies nC0 , nC1 ,nC2 , ................. nCn , then write the variance of X.


Please give detailed steps


thanks in advance .

Grade:12

1 Answers

SAGAR SINGH - IIT DELHI
879 Points
11 years ago

Dear student,

The variance is computed as the average squared deviation of each number from its mean. For example, for the numbers 1, 2, and 3, the mean is 2 and the variance is:

.

The formula  for the variance is



where μ is the mean and N is the number of scores.

When the variance is computed in a sample, the statistic

 

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Sagar Singh

B.Tech, IIT Delhi

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