問題詳情
44. A device that continuously measures and records seismic activity is placed in a remote region. The time, T, to failure of this device is exponentially distributed with mean 3 years. Since the device will not be monitored during its first two years of service, the time to discovery of its failure is X = max(T, 2).
Calculate E(X).
(A)
(B)
(C) 3
(D)
(E) 5
參考答案
答案：D
統計：A:0,B:0,C:0,D:1,E:0
難度：計算中