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Solve this faster with the right shortcut first
Shortcut used: Convert average into total first; most average questions are total questions.
Solve in 3 steps:
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Common mistake: Do not update the average without updating the total.
Question 8
Multiple Choice Question
Question
Find the average of 21, 33, 45, 57 and 69.
Explanation
Correct Answer: A
ANSWER
Correct Answer: A
Method / Topic: Average
The average is 45.
Why this answer is correct
The answer follows from total divided by number of values.
Short Explanation
The average is 45.
Detailed Explanation
Question
Find the average of 21, 33, 45, 57 and 69.
ANSWER
Correct Answer: A
Method / Topic: Average
The sum is 225. Dividing 225 by 5 gives 45.
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Question 8
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Learn + solve
Shortcut used, common trap, and the fastest solving route
Shortcut used: Convert average into total first; most average questions are total questions.
Solve in 3 steps:
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Common mistake: Do not update the average without updating the total.
Question
Find the average of 21, 33, 45, 57 and 69.
Explanation
Correct Answer: A
ANSWER
Correct Answer: A
Method / Topic: Average
The average is 45.
Why this answer is correct
The answer follows from total divided by number of values.
Short Explanation
The average is 45.
Detailed Explanation
Question
Find the average of 21, 33, 45, 57 and 69.
ANSWER
Correct Answer: A
Method / Topic: Average
The sum is 225. Dividing 225 by 5 gives 45.
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