Quick Review:
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Try to solve.
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1. The mean price of new homes from a sample of houses is $ 155,000 with a standard deviation of
$ 15,000. The data set has a bell- shaped distribution. Between what two prices do 2 standard
deviations of the houses fall? What % of data does is represent?
2. The mean price of new homes from a sample of houses is $ 155,000 with a standard deviation of
$ 15,000. The data set has a skewed distribution. Between what two prices do 3 standard
deviations of the houses fall? What % of the data does it represent?
3. Weekly salaries ( in dollars) for a sample of registered nurses are listed.
774 446 1019 795 908 667 444 960
a) Find the mean, median, and mode of the salaries. Which best describes a typical salary?
b) Find the range, variance, and standard deviation of the data set. Interpret the results.
4. The data set represents the number of minutes a sample of 25 people exercise each week.
108 139 120 123 120 132 123 131 131 157 150 124 111 101 135 119 116 117 127 128 139 119
118 114 127.
a) Construct frequency distribution with 5 classes.
b) Find mean, median, mode, range, variance, standard deviation