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142. The lifespan, in years, of a certai..-阿摩線上測驗
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142. The lifespan, in years, of a certain computer is exponentially distributed. The probability
that its lifespan exceeds four years is 0.30.
Let f(x) represent the density function of the computer’s lifespan, in years, for x ＞ 0.
Determine which of the following is an expression for f(x).
(A) 
(B) 
(C) 
(D) 
(E) 