Average marks in Physics — Tables & Charts Aptitude Question
Average marks in Physics: | Student | Maths | Physics | Chemistry | English |… Answer and worked solution on CodeKairo.
- Topic: Tables & Charts
- Section: Data Interpretation
- Difficulty: Easy
- Time target: 50 seconds
Question
| Student | Maths | Physics | Chemistry | English |
|---|---|---|---|---|
| Aditi | 88 | 76 | 92 | 71 |
| Bhavesh | 74 | 85 | 68 | 80 |
| Chirag | 91 | 90 | 79 | 65 |
| Divya | 66 | 72 | 84 | 88 |
What is the average mark in Physics across the four students?
Options
- 79.25
- 80.75
- 81.25
- 82.00
Show the answer and the worked solution
Correct answer: B. 80.75
Worked solution
- Physics marks, read down the column: 76 + 85 + 90 + 72 = 323.
- Average = 323 / 4 = 80.75.
Answer: 80.75.
The idea
Read down a column for a subject and across a row for a student. Saying which direction you need before you start prevents the commonest error in table questions.
Shortcut. Take 80 as a base: −4 + 5 + 10 − 8 = +3, so the average is 80 + 3/4 = 80.75.
Common trap. 81.25 is Chirag's own average (325 ÷ 4) — the result of reading across the row of the top Physics scorer instead of down the Physics column.