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Averages · Question 47 of 62

Question 47

EasyOriginal question

The average age of a group of 9 hikers is 34 years. A new hiker aged 24 joins them. What is the new average age of the group?

Options for question 47

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Old total = 9×34=3069 \times 34 = 306 years.

  2. New total = 306+24=330306 + 24 = 330 years for 10 people.

  3. New average = 33 years.

Worth noting

29 years averages only the old average and the newcomer, as if the group were two people.

Concept
New average when a younger member joins
Typical time
35 s
Your time
—
The rule this testsChange in average
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Ten questions from Averages, at your own pace.

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