Question

Data of weight of young and old groups of **** (students) of a senior secondary school is given below. Find the mean of the data.

| Weight in kg | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |
| Number of students | 11 | 29 | 6 | 3 | 1 |

Answer 1

| Weight in kg | No. of students(f) | xi | fixi |
| 30 – 40 | 11 | 35 | 385 |
| 40 – 50 | 29 | 45 | 1305 |
| 50 – 60 | 6 | 55 | 330 |
| 60 – 70 | 3 | 65 | 195 |
| | 1 | 75 | 75 |
| | 50 | | 2290 |