9. If X is a normally distributed random variable with mean μ = 5 and standard deviation, then find the transformation which maps the curve of the density function of X, f(x), to the curve of the standard normal distribution.

7. Suppose a continuous random variable X has probability density function:

,Which of the following graphs represents this function?

8 The time it takes Geoff to complete a crossword puzzle is normally distributed with a mean of 1 hour and a standard deviation of 12 minutes. On 10% of occasions he is able to complete the crossword in k minutes or less. Find the value of k to the nearest whole number.

6. If the scores for a VCE subject are normally distributed with a mean of 30 and a standard

deviation of 7, then approximately 68% of students score between.

5. If the length of time a certain battery will last in a graphics calculator is normally distributed with a mean of 40 hours and a standard deviation of 4.6 hours, then find the percentage of batteries which will last more than 50 hours.

4. The random variable X has a normal distribution with mean 7.2 and standard deviation 1.44. If Z is a standard normal random variable then the probability that X is more than 3.6 is

A Pr(Z < 2.5)　 B Pr(Z > 2.5)　 C 1 -Pr(Z < 2.5)　 D 1-Pr(Z > -2.5)　 E Pr(-2 < Z < 2)

3.If Z is a standard normal random variable, and Pr(Z > c) = 0.75, then find the value of c to 4 decimal place.

2.If Z is a standard normal random variable,find the 　to 4 decimal place.

1.The diagram below shows the graphs of two normal distributions with means and and standard deviations1 andrespectively. Which of the following statements is true?

A.

B.

C.

D.

E.

(二)多个材料的叙述：列举排比、简短有力　 采用列举的方式，一口气铺陈若干个事例，形成流泻奔腾的气势，这成为高考作文常用手法。

忙是省略号。四季在有规律地进行着冷暧交替，大自然就一直按照这样的规律不停地忙，为目标而不停地忙，让这种忙一直忙下去，当目标已达成，那么再找一个目标，继续这种忙，就开历史的长卷，我们看见牛顿在忙着他的实验；爱迪生在忙着思考；徐霞客在忙着记载游玩；李时珍在忙着编写《本草纲目》；再看那位以笔为刀和枪在不停地奋斗。忙是省略号，确定了一个目标那么就一直忙下去吧！这样的忙一定会忙出生命动的色彩。 　　　忙是惊叹号、世界上的人都在忙着自己的事，蜜蜂以蜂蜜为回报，那么人呢？居里夫人的忙，以放射性元素的发现而得到了圆满的休止符；爱因斯坦的忙，以相对论的问世而画上了惊叹号；李白的忙，以那豪放的诗歌而有了很大的成功；张的忙，因为那地动仪的出世而让世人得以仰慕。每个人都应该有效率地忙，而不是整天碌碌无为地白忙。人生是有限的、短暂的，因此，每个人都应该在有限的生命里忙出他人生的精彩篇章。

　　　　　　　　　　　　　　　　　　　　　　 上海考生作文《忙，不亦乐乎》

这两段都是事例排比的方式，使材料更丰富，内容更充实。