Question

Let Z be the standard normal random variable. What is P(Z<-2.38)?

0.0087

0.0708

0.0838

0.1075

None of the above

2.

Assume the average stock price for companies making up the S&P 500 at certain time period is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. How high does a stock price have to be to put a company in the bottom 10%?

		$27.20
		$20.40
		$23.55
		$18.78

3.Random samples of size 81 are taken from a process (an infinite population) whose mean and standard deviation are 100 and 27, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are

		100 and 27
		100 and 3
		200 and 2
		100 and 2

4. Let Z be the standard normal random variable. What is P(Z>-0.38)?

		0.5239
		0.7764
		0.9162
		0.9913
		None of the above

Answer 1