Frequency tables: find the mean
Multiply each value by its count and add. Then divide by the number of observations.
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A teacher asked each student how many books they read this month. Results: 2 books: 3 students; 3 books: 5 students; 4 books: 1 student; 5 books: 1 student. What is the mean?
Answer: 3
A coach counted the goals scored in each game of a season. Results: 2 goals: 2 games; 3 goals: 1 game; 4 goals: 1 game; 5 goals: 5 games. What is the mean?
Answer: 4
A survey asked each student how many pets they have. Results: 2 pets: 4 students; 3 pets: 2 students; 4 pets: 2 students; 5 pets: 1 student. What is the mean?
Answer: 3
Tip: Multiply each value by its count and add. Then divide by the number of observations.
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