Calculate the mean from the following table.
| Scores | Frequencies |
| 0-10 | 2 |
| 10-20 | 4 |
| 20-30 | 12 |
| 30-40 | 21 |
| 40-50 | 6 |
| 50-60 | 3 |
| 60-70 | 2 |
Answer & explanation
Correct answer: option 2
Total sum = 5 × 2 + 15 × 4 + 25 ×12 + 35 × 21 + 45× 6 + 55 × 3 + 65 × 2
= 10 + 60 + 300 + 735 + 270 + 165 + 130
= 1670
Mean = \(\frac{1670}{50}\)
= 33.4