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Chapter 2: Q41E (page 94)
Describe how the mean compares to the median for distribution as follows:
a.Skewed to the left
b.Skewed to the right
c.Symmetric
a. The mean is smaller than the median
b. The mean is greater than the median
c. The mean and median are the same
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Complete the following table on customer statistics.
Age of customer | Frequency | Relative Frequency |
15 or younger | 36 | - |
16 to 25 | 96 | - |
25 to 35 | 48 | - |
36 to 50 | - | 0.2 |
Older than 50 | 12 | - |
Total | 240 | 1.00 |
Calculate the mean and median of the following grade point averages:
3.2, 2.5, 2.1, 3.7, 2.8, 2.0
Using only integers between 0 and 10, construct two data sets with at least 10 observations each that have the same range but different means. Construct a dot plot for each of your data sets, and mark the mean of each data set on its dot diagram.
Calculate the variance and standard deviation for samples where
a.n= 10, 鈭�x2 = 84, 鈭�x= 20
b.n= 40, 鈭�x2 = 380, 鈭�x= 100
c.n= 20, 鈭�x2 = 18, 鈭�x= 17.
Calculate the range, variance, and standard deviation for the following samples:
a.39, 42, 40, 37, 41
b.100, 4, 7, 96, 80, 3, 1, 10, 2
c.100, 4, 7, 30, 80, 30, 42, 2
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