学帮网一道英文统计学题目.求大神指导算Z的数值 成功率Question 3 Because of a severe drought in New South Wales, Farmer Giles needs to move his cows to another property in Victoria that has not been affected by the drought. It is kn
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一道英文统计学题目.求大神指导算Z的数值 成功率
Question 3
Because of a severe drought in New South Wales, Farmer Giles needs to move his
cows to another property in Victoria that has not been affected by the drought. It
is known that a group of cows takes, on average, 16 days to make the trip
between the two farms. The time taken to make the trip is normally distributed
with a standard deviation of 2 days.
Farmer Giles has 100 cows in his herd. He can only manage to transport 20 cows
at a time. If it takes him exactly one day to return home after taking each group
of cows, how likely is it that he can transport his herd within 90 days?
看不懂就是看不懂,百度你怎么这么多事,老子不会还不行啊,为了这点经验你用得着让我打这么多字吗,几天没用知道怎么有了最低字数限制了还?百度你妈的事也太多了吧.
这个就是算期望为80，标准差为10 P（X<86）的正态分布。
化成标准正态分布就是求P（x<0.6）查表有
P（x<0.6）=0.7257Z 值是1.34 查表tailed area 是0.91 （18-16.8）/2根号5。。。。根号不会打 不过还是谢谢了农夫回来的时间你要去掉，往返5次，要消耗4天时间，实际上运牛的时间是有86天。你没考虑这个吧。...
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这个就是算期望为80，标准差为10 P（X<86）的正态分布。
化成标准正态分布就是求P（x<0.6）查表有
P（x<0.6）=0.7257
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