请教两道Prep的数学题！

frogzeen · 发表于 2008-7-30 18:29:00

1. 18356-!-item-!-187;#058&011490

Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one annual income to the average of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax, in Country R's currency, for a person in that country whose anual income is i? (C)

A. 50+i/200 B. 50+3i/200 C. 50+i/40 D. 100+i/50 E. 100+3i/100

2. 题号没找到

Town X 要做一个关于居民每周看电视所用时间的调查，这个调查的分布包括平均数21小时和标准差6小时。The number of hours that Pat, a resident of Town X, watched TV last week was between 1 and 2 standard eviations below the mean. 问Pat上周看电视所用时间可能是？ (D)

A. 30 B. 20 C. 18 D. 12 E. 6

请各位多多指教。谢谢！

呃，大家帮忙解答一下吧。。。

[此贴子已经被作者于2008-7-31 10:40:28编辑过]

frogzeen · 发表于 2008-7-31 08:50:00

呃。。。大家别光看啊。。。帮忙回答下吧。。。谢谢了~~~！

sarahzhensh · 发表于 2008-7-31 10:13:00

答案是不是 C,D 阿？请楼主给出正确答案

frogzeen · 发表于 2008-7-31 10:41:00

恩。。。是的。。。请LS的MM讲一下怎么做的吧。。。

sarahzhensh · 发表于 2008-7-31 14:17:00

1题、2%*I+（100+1%I）/2 头回见算税这么算的

2题、意思是P收看电视的时间是小于平均数1倍到2倍方差之间，即21-2*6<=T<=21-6, 就是 9到15之间

frogzeen · 发表于 2008-7-31 16:22:00

谢谢啦！好人呐。。。

请教两道Prep的数学题！

请教两道Prep的数学题！

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