228. The number of tornadoes in a given year follows a Poisson distribution with mean 3.
Calculate the variance of the number of tornadoes in a year given that at least one tornado
occurs.
(A) 1.63
(B) 1.73
(C) 2.66
(D) 3.00
(E) 3.16
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1. 題目解析 本題要求計算在至少發生一...