Mathematics
The weights of 150 mangoes were recorded as given below :
| Weight in gms | Number of mangoes |
|---|---|
| 160-170 | 15 |
| 170-180 | 24 |
| 180-190 | 30 |
| 190-200 | 36 |
| 200-210 | 24 |
| 210-220 | 12 |
| 220-230 | 9 |
Calculate the mean weight (to the nearest gram) by step-deviation method.
