Re: [計量] 兩題數學
※ 引述《orthopt (昂首闊步武陵人)》之銘言：
: A developer has land that has x feet of lake frontage.
: Theland is to be subdivided in to lots, each of which
: is to have either 80 feet or 100 feet of lake frontage.
: If 1/9 of the lots are to have 80 feet of frontage each
: and the remaining 40 lots are to have 100 feet of frontage
: each, what is the value of x?
: A)400
: B)3200
: C)3700
: D)4400
: E)4760
: ANS)D
假設有 y lots
(8/9)y=40
y=45
x=40*100+5*80=4400
: Which of the following sets of numbers has the greatest stander deviation?
: A)2,3,4
: B)2.5,3,3.5
: C)1,1.25,1.5
: D)-2,02
: F)-20,21,21.5
: ANS)D
: 要如何解 謝謝
這題是求標準差
簡單來說就是看各個選項中，那個選項的數字之間差距最大
D選項有漏打數字嗎?@@
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◆ From: 118.165.121.230
※ 編輯: yhnaushnus 來自: 118.165.121.230 (10/19 21:09)
推
10/19 21:27, , 1F
10/19 21:27, 1F
→
10/19 21:28, , 2F
10/19 21:28, 2F
→
10/19 21:51, , 3F
10/19 21:51, 3F
→
10/19 21:53, , 4F
10/19 21:53, 4F
→
10/19 21:54, , 5F
10/19 21:54, 5F
推
10/19 23:01, , 6F
10/19 23:01, 6F
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