Calculate the mean from the following table.

Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 33.4
| Score | mean value (x) | frequency (f) | fx |
| 0 - 10 | 5 | 2 | 10 |
| 10 - 20 | 15 | 4 | 60 |
| 20 - 30 | 25 | 12 | 300 |
| 30 - 40 | 35 | 21 | 735 |
|
40 - 50 |
45 | 6 | 270 |
| 50 - 60 | 55 | 3 | 165 |
| 60 - 70 | 65 | 2 | 130 |
Σf= 50 Σfx = 1670
Mean = Σfx/ Σf = 1670/50 = 33.4