作者psps1225 (鯛魚燒)
看板GRE
標題[計量] 兩題問題 麻煩各為了
時間Sun Sep 22 09:42:45 2013
1. What is the nonnegative difference between the values of 3(k-2) and 3k-6?
a.0
b.2
c.4
d.6
e.It cannot be determined from the information given.
2.WINK, Inc. is made up of 450 employees who work a total of 13500 hours per
week. If the number of weekly work hours per person has a normal distribution
and the standard deviation equals 7 hours, how many employees work more than
37 hours per week?
(P.S.標準差問題一直是我的弱項 可能跟高中數學沒怎麼接觸有關
大學時實驗數據整理也是抄公式 按按計算機就解決了... 順便也求個速成法吧XD)
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◆ From: 59.115.100.20
推 hopeboy :a 72 如果我沒搞錯的話 09/22 10:14
→ tonychung :同上 09/22 10:17
推 kbn2300 :同上 09/22 10:34
推 frank11118 :同上 09/22 11:14
→ ru12151 :速成法應該就是背好68 -95- 99，7 法則吧 09/22 11:59
→ blueseal :GRE標準差的問題都不難，看OG就都能解了 09/22 12:00
→ blueseal :OG其實也沒幾頁 09/22 12:01
推 ryanlei :68, 95, 99.7那個要背 考試不會給這些數字 09/22 20:32