求问道OG上正态分布的题

marygbeach · 发表于 2012-7-7 23:20:29

.The figure shows a normal distribution with mean m and standard deviationd, including approximate percents of the distribution corresponding to thesix regions shown.

Suppose the heights of a population of 3,000 adult penguins areapproximately normally distributed with a mean of 65 centimeters and astandard deviation of 5 centimeters.

(a) Approximately how many of the adult penguins are between 65centimeters and 75 centimeters tall?

(b) If an adult penguin is chosen at random from the population,approximately what is the probability that the penguin’s height will beless than 60 centimeters? Give your answer to the nearest 0.05

第二问的最后一句话 “Give your answer to the nearest 0.05” 应该如何理解？

xxx111zz · 发表于 2012-7-7 23:26:15

就是比如你算的概率是0.77 那么就取0.75

marygbeach · 发表于 2012-7-8 09:25:16

那为什么不是取0。80

竹林中人 · 发表于 2012-7-8 09:27:38

最近的，不是让你四舍五入

zhouxiaofei170 · 发表于 2012-7-12 11:26:38

a) 3000*(0.34+0.14)=1440

b)0.5-0.34=0.16 ~= 0.15

[数学] 求问道OG上正态分布的题

所属分类: GRE考试

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