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JEE Main 2013 Mathematics question

MathematicsStatisticsJEE Main 2013

Mean of 5 observations is 7 . If four of these observations are 6, 7, 8, 10 and one is missing then the variance of all the five observations is :

Answer: (1)

Solution

Missing observation = 35 − 31 = 4. Deviations from 7: −1, 0, 1, 3, −3; squares sum to 20.

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Question ID VK-104059