作者stonycindy (Esperanza)
看板Statistics
標題[問題]又是機率...
時間Fri Apr 14 02:53:39 2006
Q1. 若E(X^r)=5^r，r=1,2,3,...，求X的動差母函數M(t)和X之p.m.f.。
Q2. Suppose an airport metal detector catches a person with a metal 99% of the
time. That is, it misses detecting a person with metal 1% of the time.
Assuming independence of people carrying metal, what is the probability
that the first person missed(not detected) is among the first 50 persons?
Answer:0.395
Q3. From 1999-2002 Red Rose Tea randomly placed one of 10 English porcelain
miniature animals in a 100-bag box of Red Rose Tea, selecting from 10
endangered North American animals.
(a) If the customer uses one tea bag per day, how long will it take,
approximately, to obtain a complete collection?
Answer:(a) 8
麻煩寫一下算式，
謝謝啦！
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.124.135.96