作者pyramid125 (上了没....)
看板Statistics
标题[问题] 问两个机率问题...谢谢高手
时间Tue May 2 20:23:46 2006
1.A factory produces 10 glass containers daily. It may be assumed that
there is a constant probability p=0.1 of producing a defective container.
Before these containers are stored they are inspected and the defective
ones are set aside. Suppose that there is a constant probability r = 0.1
that a defective container is misclassified. Let X equal the number of
containers classified as defective at the end of a production day.
(Suppose that all containers which are manufactured on a particular
day are also inspected on that day.) Compute P(X=2)=?
a. 0.1937
b. 0.1714
c. 0.2541
d. None of above.
2. What is the required discrimination of a comparator given a
tolerance of 0.005 and an accuracy ratio of 10:1?
第一题的答案 参考书好像是选 D 因为 C10取2*0.01^2*0.99^8 = 0.00415
可是我是选 B 因为 C10取2*0.09^2*0.91^8 = 0.1714
第二题的题目在写什麽 有人可以解释吗 英文每个字都懂 组起来就不懂...><
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1F：推 statbaby:第一题你是对的. 第二题我看不懂 05/03 08:49
2F：推 mangogogo:第二题应该是求样本数 05/03 16:45
3F：推 wolf035:第一题为什麽对呀?? p不是0.1^2吗 05/03 19:11