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 1
Total frequency = 2 + 4 + 12 + 21 + 6 + 3+ 2 = 50
Mean = \(\frac{5×2 + 15×4 + 25×12 + 35×21 + 45×6 + 55×3 + 65×2 }{50}\)
= \(\frac{10 + 60 + 300 + 735 + 270 + 165 + 130 }{50}\)
= \(\frac{ 1670}{50}\)
= 33.4