Bernoulli Trial 问题. 经济学统计和概率。求学霸~~！ 悬赏5分1. Pr[X = 7] = .68, and Pr[X = 12] = .32. Y = a + bX is a Bernoulli trial, with p = .68. What are a and b?2.X is a Bernoulli trial, where p = .7. Y = a + bX, where Pr[Y = 25] = .7 and Pr[Y =53] = .3. What are a and b?
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伯努利试验的结果只有0和1。由已知X=7时Y=1(因为p=0.68，对应的是X=7)，X=12时Y=0。故有a+7b=1,a+12b=0，解方程组得a=-1/5，b=12/5
由已知Y=25对应X=1，Y=53对应X=0，故25=a+b,53=a，解方程组得a=53，b=-28。