Question 25 please urgent
Dear student,
| X | f | m | d (m - A) |
d' | d'2 | fd' | fd'2 |
| 0-10 | 8 | 5 | -30 | -3 | 9 | -24 | 72 |
| 10-20 | 12 | 15 | -20 | -2 | 4 | -24 | 48 |
| 20-30 | 17 | 25 | -10 | -1 | 1 | -17 | 17 |
| 30-40 | 14 | 35=A | 0 | 0 | 0 | 0 | 0 |
| 40-50 | 9 | 45 | 10 | 1 | 1 | 9 | 9 |
| 50-60 | 7 | 55 | 20 | 2 | 4 | 14 | 28 |
| 60-70 | 4 | 65 | 30 | 3 | 9 | 12 | 36 |
| 71 | -30 | 210 |
Regards