Study the given table and answer the question that follows.
The given table provides information about percentage marks obtained by students of classes X, XI and XII during 2020-2022.
| Year | Percentage Marks | ||
| X | XI | XII | |
| 2020 | 90 | 80 | 94 |
| 2021 | 80 | 85 | 96 |
| 2022 | 70 | 90 | 98 |
What is the difference between the average percentage marks of class X and XII during 2020-2022?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 16%.
Formula: Average = (Sum of values) ÷ (Number of values)
Average of class X = (90 + 80 + 70) ÷ 3
= 240 ÷ 3
= 80
Average of class XII = (94 + 96 + 98) ÷ 3
= 288 ÷ 3
= 96
Difference = 96 − 80
= 16