1. (15%) The life tinio (in years) of a. kind of light bull) lias the exponential distrbution
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(iii) A light, bulb has been used for one year, whal; is the prohabilil;y that I;lie light; bulb can be used for antlier year，ami wliai, is he expectation of Ihe life time of this light, bulb.
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