Question: 1. In a sample data consisting of three observations, the mean is equal to the median and the sum of the three values is 39.

1. In a sample data consisting of three observations, the mean is equal to the median and the sum of the three values is 39. If the range of the three values is 60, then the sample variance = .

2. The mean and median of a sample of three values are 40 and 49 respectively. If the median is larger than the smallest value by 32, then the sample variance =

3. The following table is set up to calculate the standard deviation of a sample of 6 credit card balances (x)(). A negative balance indicates an overpayment.

Fill in the missing values.

Card	x	xx-	(xx)2(-)2
1		58	3364
2	17		784
3	117		5184
4		63	3969
5	16	-29
6		-136	18496
Total	270

The sample standard deviation, s==

4. The following chart shows the distribution of exam grades for a sample of 76 students in a statistics course. The class intervals are 20 to under 30, 30 to under 40, and so on. Class frequencies are displayed on the bars.

Question: 1. In a sample data consisting of three observations, the mean is equal to the median and the sum of the three values is 39.

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