Re: [計量] GWD 01-37
※ 引述《chengyuyang ()》之銘言：
: ※ 引述《a1985526 (new)》之銘言：
: : Q: Of the 500 business people surveyed, 78 percent said that they use their
: : laptop computer in hotels, and 52 percent said that they use them both at home
: : and in hotels. How many of the business people surveyed said that they do not
: : use their laptop computers either at home or in the hotels?
: : A. 45 B. 55 C. 65 D.95 E. 130
: : Ans: A
: : 要怎麼求出the percentage of people use laptop at home?
: : 或者不需要知道也算得出答案嗎?
: : 謝謝!
: Of the 500 business people surveyed, 78 percent said that they use their
: laptop computers at home, 65 percent said that they use them in hotels,and
: 52 percent said that they use them both at home and in hotels.
: How many of the business people surveyed said that they do not use their
: laptop computers either at home or in hotels?
: .78*500=390at home
: .65*500=325in hotels
: .52*500=260 both
: 500-390-325+260=45
: 你少了一大句了
Home+hotel=78+65-52=91%
1-91=9% 沒用laptop
500*9%=5*9=45人,選(A)
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