Consider the following probability distribution of the random variable x. 10 20 30 f(x) 0.30 0.40 ? Find P(x = 30). Select one: O a. 0.60 O b. 0.50 O c. 0.30 o d. 0.40

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A: Mean(μ)=E(X)=∑x.P(X)E(X2)=∑x2.P(X)variance(σ2)=E(X2)-(E(X))2Standard deviation(σ)=E(X2)-(E(X))2

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