試題詳解

239. The number of minor surgeries, X, and the number of major surgeries, Y, for a policyholder, this decade, has joint cumulative distribution function

for nonnegative integers x and y.

Calculate the probability that the policyholder experiences exactly three minor surgeries and exactly three major surgeries this decade.
(A) 0.00004
(B) 0.00040
(C) 0.03244
(D) 0.06800
(E) 0.12440