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CT3-SEP 20-16

A

Anjum

Member
Ques 1. While finding the variance we should be dividing sum of (X(i)-mean)^2 by n-1, but in the solutions it has been divided by n why?

upload_2017-2-11_16-53-43.png

Answer should be (10000)^0.5 i.e 100 and not 99.5 pls help
 
When we have sample data for a population, then we divide by n-1 in calculation of variance.

When the population data is directly available, then n is used in the denominator.
 
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