The score in Maths of 50 students of a class is given in the following table. Calculate the mean score.
| Interval | Frequencies |
| 0-10 | 2 |
| 10-20 | 11 |
| 20-30 | 28 |
| 30-40 | 6 |
| 40-50 | 3 |
Answer & explanation
Correct answer: option 3
Mean score = \(\frac{5× 2 + 15 × 11 + 25× 28 + 35× 6+45× 3 }{50}\)
= \(\frac{10 + 165 + 700 + 210 +135 }{50}\)
= \(\frac{1220 }{50}\)
= 24.4