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JEE Main Math Class 12 Statistics Part 2 Questions

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Question : 17

Total: 28

The mean and variance of a set of 15 numbers are 12 and 14 respectively. The mean and variance of another set of 15 numbers are 14 and σ2 respectively. If the variance of all the 30 numbers in the two sets is 13 , then σ2 is equal to :

[6-Apr-2023 shift 1]

12
10
11
9

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