題組內容

3. (Total 30%) Let Y denote the Jength of life (in hundreds of hours) of electronic compo- nents. These components frequently fail immediately upon insertion into a system. It has been observed that the probability of immediate failure is 1 /3. If a component does not fail immediately, the distribution for its length of life has the exponential density function
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(2) (10%) Evaluate P(Y ＞ 10).