A PMF gives P(X=1)=0.2, P(X=2)=0.5, P(X=3)=0.3. E(X) =
- A
1.5
- Bcheck_circle
2.1
- C
2.0
- D
2.5
Explanation
1·0.2 + 2·0.5 + 3·0.3 = 0.2 + 1.0 + 0.9 = 2.1.
Introduction to Random Variables and Probability Distributions
AP Statistics· difficulty 3/5
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