求助一个题！
题目是这样的：
The hazard rate function for a device is given by
0.001 if t<=10 hours
and 0.01 if t>10 hours
What is the reliability of this device at 12 hours?
(A) 0.970
(B) 0.980
(C) 0.988
(D) 0.990
我算出来的答案应该是0.972，好象跟哪个都对不上。各位是否可帮我算算看！
The hazard rate function for a device is given by
0.001 if t<=10 hours
and 0.01 if t>10 hours
What is the reliability of this device at 12 hours?
(A) 0.970
(B) 0.980
(C) 0.988
(D) 0.990
我算出来的答案应该是0.972，好象跟哪个都对不上。各位是否可帮我算算看！
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amycaisha (威望:1) (广东 深圳) 电子制造 主管 - 不以物喜,不以己悲. 物竞天择, 适者生存. ...
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