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Math / Statistics / Grade 11 / mtbda

Keep the Weights in an Average - Practice 1

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 2 and three values of 7. What is its mean?
Question 2 A data set contains two values of 3 and three values of 8. What is its mean?
Question 3 A data set contains two values of 4 and three values of 9. What is its mean?
Question 4 A data set contains two values of 5 and three values of 10. What is its mean?
Question 5 A data set contains two values of 6 and three values of 11. What is its mean?