For discrete random 'X', the expectation of X i.e., E(x) is equal to:________________?
Correct answer: B. ∑x.P(x)
- A. ∑P(x)
- B. ∑x.P(x)
- C. ∑x2P(x)
- D. One
Explanation
For a discrete random variable, expected value is obtained by multiplying each value by its probability and summing: E(X)=∑xP(x). The other sums represent total probability or, in the squared case, a second-moment quantity.
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