RT 在下数学真心弱。。。见笑了。。。望各位NN不吝赐教。。~ 拜谢~ 1. For every positive even integer n, the function h(n) is defined to be the product of all the even integers from 2 to n, inclusive. If p is the smallest prime factor of h(100) +1, then p is A. between 2 and 10 B.between 10 and 20 C.between 20 and 30 D.between 30 and 40 E.greater than 40 答案是E。。。
2.According to the directions on a can of frozen orange juice concentrate. 1 can 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 services of orange juice? 答案是25.。。 但是我怎么算都是40上下、。。纠结
3. The residents of Town X participated in a survey to determine the number of hours per week each resident spent watching televition. The distribution of the survey had a mean of 21 hours and a standard deviation of the survey had a mean of 21 hours and a standard deviation of 6 hours. The number of hours that Pat, a resident of Town X, watched televition last week was 1 and 2 standard deviation below the mean.(这句话看得不是很懂。。) Which of following could be the hours Pat watched TV last week? A.30 B.20 C.18 D.12 E.6 答案是D.12 4. x,y,z 都是大于1 的整数，求X+Y+Z? (DS题) a.xyz=70 b.(x/yz)=(7/10)
第三题题目表述也错了，应该是“The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean.” 差了between会害死人的。 所以答案应该在9(=21-2*6)和15(=21-6)之间
第三题题目表述也错了，应该是“The number of hours that Pat, a resident of Town X, watched television last week was between 1 and 2 standard deviations below the mean.” 差了between会害死人的。 所以答案应该在9(=21-2*6)和15(=21-6)之间
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发表于 2011-11-27 22:14:55
) Which of following could be the hours Pat watched TV last week?
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