Re: [計量] Strange JJ
※ 引述《zoo22 (zoo)》之銘言：
: 9. Roger sold a watch at a profit of 10%. If he had bought it at
: 10% less and sold it for $13 less he would have made a profit of 15%.
: What is the cost price of the watch?
: A) $220
: B) $300
: C) $400
: D) $480
: E) $540
: Ans: A
這一題的sold price應該是問Roger賣錶的價錢 而不是他買進的價錢
: 7. If from jan 1 1990 to jan 1 1995 i.e. in 5 yrs the population increased by
: 15% and from jan1 1990 to jan 1 2000 i.e. in the period of 10yrs the population
: increased by 30%
: col a: the population increase from jan 1 1995 to jan 1 2000
: colb :15%
Ans:B
設1990年:X人
1995年:115/100人....(1)
2000年:130/100人....(2)
col a =(2)-(1)/(1)=3/23=15/115 < 15/100
: How many combinations of three numbers from 1 to 10 can be made such that x<y<z.
: where x,y,z belongs to 1 to 10
: ex: (1,2,3) ; (2,4,10)
: Ans: 512
這題我怎麼覺得是450...
如果固定y 總共是10x1x9+10x1x8+.....+10x1x1=10x(9+8+7+....1)=450
不知道哪裡算錯?
: Probability that it will rain on monday and not on tuesday is 0.4
: Probability that it will rain on tuesday and not on monday is 0.2.
: Cola: Probability that it will not rain on both the days
: Colb: 0.35
: Ans: A???
不知道這題col A是不是0.4+0.2...
因為是獨立事件所以相加就好了?
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◆ From: 61.229.235.237
※ 編輯: chiehmei 來自: 61.229.235.237 (10/23 01:51)
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10/23 10:26, , 1F
10/23 10:26, 1F
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