Group Mean Variance df n 1 10000   1000 30 2 9000   800 30 3 8000   500 30 4 10500   700 30 Find the variance for the above data  df= Standard deviation  n = sampled data

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Group Mean Variance df n
1 10000   1000 30
2 9000   800 30
3 8000   500 30
4 10500   700 30

Find the variance for the above data 

df= Standard deviation 

n = sampled data

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