x21P(Xi) 2 x1 0, x2 1, x3 2, x4 3, P(x1) 0 4, P(x2) 0 1, P (x3) 0 2, P (x4) 0 3, 1 4 (standard deviation of a discrete random variable) ...

= [x21P(Xi)] 2; x1 = 0, x2 = 1, x3 = 2, x4 = 3,

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σ = √∑ [x21P(Xi)] – μ2; x1 = 0, x2 = 1, x3 = 2, x4 = 3, P(x1) = 0.4, P(x2) = 0.1, P (x3) = 0.2, P (x4) = 0.3, μ = 1.4 (standard deviation of a discrete random variable)

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A Pathway To Introductory Statistics

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