作者victim0130 (Maxwell)
看板GRE
标题[问题] 计量一题求解
时间Sun Jul 3 23:27:01 2016
In a normal distribution, 68% of the scores lie within
one standard deviation of the mean. If the SAT scores of
all the high school juniors in Center City followed a normal
distribution with a mean of 500 and a standard deviation of 100,
and if 10,200 students scored between 400 and 500,
approximately how many students scored above 600?
(A)2,400
(B)4,800
(C)5,100
(D)7,200
(E)9,600
答案(B)，但不知道怎麽算，
麻烦板上大大解惑，谢谢!
--
※ 发信站: 批踢踢实业坊(ptt.cc), 来自: 220.135.234.235
※ 文章网址: https://webptt.com/cn.aspx?n=bbs/GRE/M.1467559623.A.335.html
1F：→ b01901059 : 34%=10200 07/03 23:33
2F：→ b01901059 : 16%=? 07/03 23:33
3F：推 blueminder : 因为normal distribution, <400=>600, (100-68)/2 07/03 23:36
4F：→ blueminder : =16 07/03 23:36
5F：→ victim0130 : 谢谢各位!! 07/03 23:55