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Learning Math Home
Data Session 10, Grades 6-8: Solutions
Session 10 Session 10 6-8 Part A Part B Part C Part D Homework
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Solutions for Session 10, Part B

See solutions for Problems: B1 | B2 | B3 | B4 | B5

Problem B1

Answers will vary. Two questions that involve qualitative (categorical) data that could be displayed with bar graphs and might interest students are, "What is your favorite type of music?" and "What is your favorite musical group?" Two questions involving quantitative (numerical) data that could be displayed on line plots are, "How many hours do you spend per week in chat rooms?" and "How much money do you spend on CDs each month?"

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Problem B2

One such question might be, "What is the relationship between grade point average and the number of hours a student studies?" A scatter plot would be an appropriate way to display this data.

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Problem B3


A response based on the mode might be to make the prices of all nine bags exactly $1.38. Another response based on the mode is to price four bags at $1.38 and the others at $1.30, $1.32, $1.36, $1.37, and $1.50. The reasoning is to place more bags at $1.38 than at any other price.


A response that is based on the median is to make three bags cost $1.38 and the others cost $1.30, $1.30, $1.35, $1.40, $1.47, and $1.49. The reasoning is to put some bags at $1.38 and then to place an equal number of bags at prices lower and higher than $1.38. Here, three bags cost more than $1.38 and three bags cost less than $1.38.


A response that is based on the mean is to make the bags cost $1.38, $1.37, $1.39, $1.36, $1.40, $1.35, $1.41, $1.34, and $1.42. Since there's an odd number of bags, the reasoning is to place one bag at $1.38 and then add and subtract the same amount to create new prices. Here, 1 cent was subtracted from $1.38 to get $1.37, then 1 cent was added to $1.38 to get $1.39, and so on.

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Problem B4








Mode or median



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Problem B5

Answers will vary. You may want to use the suggestions for action research to assess your own students' understanding of average. How would they respond to the potato-chip task?

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