Teaching MPPSC Assistant Professor Mock Test Series 2025 General Knowledge Economy

If Xi is a random variable with probability pi (i = 1, 2... n), then

1
E(X) = \(\frac{\sum X_i}{\sum p_i}\)
2
E(X) = Σ pi Xi
3
E(X) = Σ pi E(Xi)
4
E(X) = Σ E(pi Xi)
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