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- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
Correct Answer: C
Correct Answer: C
Method / Topic: Average
The answer follows from total divided by number of values.
Short Explanation
Detailed Explanation
Correct Answer: C
Method / Topic: Average
Total of 8 numbers = 8×24 = 192. Removed numbers are 18 and 30, whose sum is 48. Remaining total = 192 - 48 = 144. Now 6 numbers are left. New average = 144/6 = 24. Notice that the removed numbers themselves have average 24, so the overall average remains unchanged.
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Write average and count.
- Find total = average x count.
- Adjust total if values are added/removed/replaced.
The average of 8 numbers is 24. If two numbers 18 and 30 are removed, what is the average of the remaining numbers?
Explanation
Correct Answer: C
Method / Topic: Average
The answer follows from total divided by number of values.
Short Explanation
Detailed Explanation
Correct Answer: C
Method / Topic: Average
Total of 8 numbers = 8×24 = 192. Removed numbers are 18 and 30, whose sum is 48. Remaining total = 192 - 48 = 144. Now 6 numbers are left. New average = 144/6 = 24. Notice that the removed numbers themselves have average 24, so the overall average remains unchanged.
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