1.	Find the standard deviation of the data in the stem-and-leaf plot to the nearest hundredth.
		A.	228.50	B.	10.72
		C.	217.00	D.	11.74
		Hint
	2.	The scores on a national achievement test are normally distributed with a mean of 50 and a standard deviation of 10. Out of a group of 200 students, how many would you expect to score more than 70?
		A.	1	B.	5
		C.	10	D.	32
		Hint
	3.	Suppose that the mean is 50. How many standard deviations away is the value 65?
		A.	about 1 standard deviation	B.	about 2 standard deviations
		C.	cannot be determined from given information	D.	within 1 standard deviation
		Hint
	4.	Compute the variance and standard deviation for the set of {3, 4, 4, 7, 9, 9, 12, 16}. Round to the nearest tenth.
		A.	16.5; 4.1	B.	4.2; 2.0
		C.	15.8; 4.0	D.	17.5; 4.2
		Hint
	5.	Compute the variance and standard deviation for the set of {284, 298, 302, 305, 310, 314, 321, 331, 337, 348}. Round to the nearest tenth.
		A.	341.0; 18.5	B.	289.2; 17.0
		C.	337.9; 18.4	D.	335.7; 18.3
		Hint