16. On any given day, a salesman can earn $0 with a 30% probability, $100 with a
20% probability, or $300 with a 50% probability. His expected earnings equal
(A) $0.
(B) $100.
(C)$150.
(D) $170.
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統計: A(0), B(0), C(0), D(1), E(0) #2847475
統計: A(0), B(0), C(0), D(1), E(0) #2847475