Question

訪客.

求解這題的計算過程 我分部積分積不出來 答案是0.6109 。

5.2. A group of construction workers take time X (in
hours) to finish a task. The density function of time X is
f(x)
=
cxe-√x
0
x ≥ 0
otherwise
What is the probability that the workers will take more
than 10 hours to complete the task?

Answer 1

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changsheng0120

大致上這樣算
在做分部積分之前，我會先建議令x=y^2，dx=2ydy，這樣再做分部積分會比較好算