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
: 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)-2,0,2
: F)-20,21,21.5
: ANS)D
: 要如何解 謝謝
請問這題題目有打錯或漏打嗎?
因為我最後一個選項偷按工程計算機23.817
如果答案是D 那最後一個選項應該是20, 21, 21.5
那這樣標準差是0.76(我用計算機的)
所以D的標準差的確是最大(=2)
這題大部分選項剛好都是等差數列 所以樣品標準差會等於等差
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