6.Suppose U1 and U2 are independent uniform random variables on [0,1]. Let X = min{U1, U2}. What is E[X] ?
(A) 1/4
(B) 1/3
(C) 1/2
(D) 2/3
(E) 3/4

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統計： A(1), B(1), C(0), D(0), E(0) #2852332