Re: [計量] GWD 01-37
※ 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
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10/30 23:47, , 1F
10/30 23:47, 1F
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