The variance of five positive observations is 3 6. If four of the observations are 2, 2, 4, 5 then what is the remaining observation?

NDA 2022 Mathematics question

The variance of five positive observations is . If four of the observations are 2, 2, 4, 5 then what is the remaining observation?

Answer: (C)

Let the fifth observation be . and . Variance: $-( =

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Question ID VK-029394