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Quiz: Averages

5 questionsNo time limitPass: 60%+10 XP on first pass

Average means "level everything out". Learn the formula, the deviation shortcut, what happens when someone joins or leaves a group, and average speed.

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  1. Question 1

    The average of 6 numbers is 20. If one number, 30, is removed, what is the new average?

  2. Question 2

    What is the average of the first 20 natural numbers?

  3. Question 3

    A man walks to the office at 6 km/h and returns at 4 km/h on the same road. What is his average speed?

  4. Question 4

    The average age of a family of 4 is 25 years. A baby is born. What is the average age of the family of 5 now?

  5. Question 5

    The average of 3 numbers is 28. The first is twice the second and the second is twice the third. What is the first number?