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JEE Main 2010 Mathematics question

MathematicsStatisticsJEE Main 2010

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

Answer: (1)

Solution

and . Combined

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Question ID VK-039271