[理工] [統計] 成大
這成大的考古題沒有答案...
想上來與版上的大大一起討論討論
是99製造的!!
http://ppt.cc/;0np
裡面的第1、2、4我都有點不太確定..
2. A fault-tolerant system that processes transactions for a financial service
use three separate computers. If the operating computer fails , one of the
two spares can be immediately switched online. After the second computer
fails , the last computer can be immediately switched online. Assume the
probability of failure during any transaction is 1O^-8
(Q) State the proper probability model for the number of transactions X before
all three computers have failed. Write out the probability function and
cumulative distribution function of X.
4. A manufacturer of automobile batteries claims that the distribution of the
life of its battery has a mean of 54 months and a standard deviation of 6
monWhat is the probability the consumer group's sample has a mean life of a mean
life of 52 or fewer months? ths. But the population mean is 50 months and population standard
deviation is7 months. Suppose a consumer group decides to check the claim by
purchasing a sample of 50 of these batteries. No knowledge of the shape of
the distribution of the life.
(Q). Try to describe the sampling distribution of the mean life of a sample of
50 batteries
不知道是不是我英文太差= =
第二題是不大確定該用什麼分配
第四題該用54還是52去估呢??
感謝大家...
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