ExamPrepWay
Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Solve this faster with the right shortcut first
- 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
Average × number of observations gives the total. Original total = 8×21 = 168. After adding 30, new total = 168+30 = 198. Now there are 9 observations. New average = 198/9 = 22.
See full explanation + shortcut trick
Compare the quick idea with the premium step-by-step explanation and faster solving trick for this pattern.
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 observations is 21. If one observation 30 is added, what will be the new average?
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
Average × number of observations gives the total. Original total = 8×21 = 168. After adding 30, new total = 168+30 = 198. Now there are 9 observations. New average = 198/9 = 22.
See full explanation + shortcut trick
Use the free answer check first, then unlock the complete breakdown, shortcut path, and richer explanations for similar questions.
Keep Practicing This Pattern
Recommended Next Practice
Use these suggestions after solving the practice questions above.