NAME DATE PERIOD Lesson 5 Skills Practice
NAME _____________________________________________ DATE __________________ PERIOD _________
Lesson 5 Skills Practice
Measures of Variation
For Exercises 1-4, find the mean absolute deviation of each set of data. Round to the nearest tenth if necessary. Describe what the mean absolute deviation represents.
1. Basketball Scores
41 37 50 38 46 54 42 56 49 47
2.
Books Read
15 12 10 24 32 18 23 19 30 27
5.2; Sample answer: The average distance each data value is from the mean is 5.2 points.
6.2; Sample answer: The average distance each data value is from the mean is 6.2 books.
3. Miles Traveled
110 85 90 115 115 80 125 85 95
14.4; Sample answer: The average distance each data value is from the mean is 14.4 miles.
4.
Bagels Sold
65 74 91 99 104 93 62 92 75 119 116 54
17.5; Sample answer: The average distance each data value is from the mean is 17.5 bagels.
5. Refer to the table in Exercise 1. The standard deviation is about 6.5 points. Describe the data values that are within one standard deviation of the mean.
Basketball scores between 39.5 and 52.5 points are within one standard deviation of the mean.
Copyright ? The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
6. Refer to the table in Exercise 2. The standard deviation is about 7.5 books. Describe the data values that are within one standard deviation of the mean.
Data values between 13.5 and 28.5 books are within one standard deviation of the mean.
140
Course 3 ? Chapter 9 Scatter Plots and Data Analysis
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