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（1）1can of concentrate is to be mixed with 3 cans of water to make orange juice,How many 12-ounce cans of the concentrate are required to prepare 2006-ounce servings of orange juice?这个是模考软件里的，答案是25，可是得不出这个数啊。求高手解答啦
(2) The residents of town x participated in a survey to determine the number of hours per week each resident spent watching television .The distribution of the results of the survey had a mean of 21hours and a standard deviation of 6hours.The number of hours that Pat,a resident of town x,watched television last week was between 1 and 2standard deviations below the mean.Which of the following could be the number hours that Pat watched last week?
A30 B20 C18 D12 E6 答案是D
(3)A certain law firm consists of 4senior partners and 6 juniore partners.how manydifferent groups of 3 partners can be formed in which at least one member of the group is a senior partner?(Two groups are considered different if at least one group member is different) 答案是100
（4）A certain city with a population of 132000 is to be divided into 11voting districts,and no district is to have a population that is more than 10percent greater than the population of any other district.What is the minimum possible population that the least populated district could have?
A10,700 B10,800 C10,900 D10,000 E 11,100 选D
模考软件提供了正确答案，可是不知道解题过程，求好心人帮帮我呀 |
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发表于 2010-12-13 15:35:12
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