Exam

Name___________________________________

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Provide an appropriate response.
1)	The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at most 200 homes are going to be used as investment property?	1) ______

	A)  0.0934
	B)  0.5935
	C)  0.4066
	D)  0.9099

2)

The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the probability that at least 175 homes are going to be used as investment property?

2) ______

	A)  0.4821
	B)  0.7764
	C)  0.5189
	D)  0.2236

3)

Assume that blood pressure readings are normally distributed with a mean of 122 and a standard deviation of 9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 124.

3) ______

	A)  0.9998
	B)  0.9938
	C)  0.8615
	D)  0.0062

Solve the problem.
4)	The weight of corn chips dispensed into a 15-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean of 15.5 ounces and a standard deviation of 0.1 ounce. Suppose 400 bags of chips are randomly selected. Find the probability that the mean weight of these 400 bags exceeds 15.6 ounces.	4) ______

	A)  .1915
	B)  .3085
	C)  .6915
	D)  approximately 0