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Math / Statistics / Grade 11 / mtbdb

Keep the Weights in an Average - Practice 2

Multiply each value by its frequency.

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Multiply each value by its frequency. Add these contributions and divide by total frequency, not by the number of distinct values.

Worked example

Two values of 4 and three values of 9 have mean (2 x 4 + 3 x 9) / 5 = 7.

Two values of 4 and three values of 9 have mean (2 x 4 + 3 x 9) / 5 = 7.
Worked model: Two values of 4 and three values of 9 have mean (2 x 4 + 3 x 9) / 5 = 7.
Question 1 A data set contains two values of 7 and three values of 12. What is its mean?
Question 2 A data set contains two values of 8 and three values of 13. What is its mean?
Question 3 A data set contains two values of 9 and three values of 14. What is its mean?
Question 4 A data set contains two values of 10 and three values of 15. What is its mean?
Question 5 A data set contains two values of 11 and three values of 16. What is its mean?