Let X be a random variable whose possible values x 1- x 2- x 3- - x n occur with probabilities p 1- p 2- p 3- - p n- respectively- Also- E X is the expectation ofX- then E x 2- E x -2 is known asA- VarianceB- MeanC- Mean x varianceD- Standard deviation

The correct option is A Variance ...

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Standard XII

Mathematics

Standard Deviation

Let X be a ra...

Question

Let X be a random variable whose possible values x₁, x₂, x₃, ..., x_n occur with probabilities p₁, p₂, p₃,..., p_n, respectively. Also, E(X) is the expectation of X, then E(x²) – [E(x)]² is known as

Standard deviation

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Variance

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Mean

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Mean x variance

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Solution

The correct option is B
Variance

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