作者bill35 (Bill)
看板Statistics
标题[问题] 101台大商研关於Poi
时间Sun Dec 30 18:12:06 2012
题目如下:
Ellen is taking a typing lesson and her assingment is to type a 10-page
report in one hour. The number of typing errors she makes per page has
a Poisson distibution with mean of 浪打=2(抱歉我不会打那个符号)
What is the probability that Ellen does not make any typing error in one
randomly selected page?
这题我觉得计算上每一页的浪打应该就是2/per page
可是解答写说浪打应该是0.2/per page。
可是他倒数第二行不就写she makes per page has a poisson distribution with
mean of 浪打=2吗
为什麽他还要除以10,是解答写错还是我脑袋有问题?
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◆ From: 49.159.161.187
1F:→ sowter:type a 10-page 应该是10页mean是2 -> 1页 mean 2/10=0.2 12/31 13:29
2F:→ sowter:英文不太好 不知道想法对不对 12/31 13:29
3F:→ yhliu:per page 的平均 typing errors 是 2. 12/31 23:15
4F:→ yhliu:谁保证 "解答" 无误? 12/31 23:15
5F:→ bill35:感谢Y大,我也认为是2,明明就讲per page了,怎麽还除以10 01/01 00:16