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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 stepsthanks in advance .

Sudheesh Singanamalla , 13 Years ago
Grade 12
anser 1 Answers
SAGAR SINGH - IIT DELHI

Last Activity: 13 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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