# For two data sets, each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4, respectively. The variance of the combined data set is Option 1) Option 2) Option 3) Option 4) As we learnt in

ARITHMETIC Mean -

The arithmetic mean is defined as the sum of items divided by the number of items.

-

and

Variance -

In case of discrete data -

Given v1=4 and v2=5  and     Variance = = 14.5-9=5.5= Option 1) This is incorrect option

Option 2) This is correct option

Option 3) This is incorrect option

Option 4) This is incorrect option

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