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MHT CET 2022 Mathematics question

MathematicsStatisticsMHT CET 2022

The random variable X assumes values 1, 2, 3, ...... n with equal probabilities. If the ratio of variance of X to expected value of X is equal to 4, then the value of n is

Answer: (D)

Solution

For equal probabilities , and , so . The ratio is

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Question ID VK-093597