Find the mean of the data given below.
| Marks obtained | 5 - 15 | 15 - 25 | 25 - 35 | 35 - 45 | 45 - 55 |
| No. of students | 3 | 5 | 9 | 3 | 2 |
1 Answer
Here, preparing a table to calculate the mean, we get.
| Marks obtained (X) | No of students(F) | Mid value(M) | FM |
| 5 - 15 | 3 | 10 | 30 |
| 15 - 25 | 5 | 20 | 100 |
| 25 - 35 | 9 | 30 | 270 |
| 35 - 45 | 3 | 40 | 120 |
| 45 - 55 | 2 | 50 | 100 |
| N = 22 | Σfm = 620 |
Now, by formula
mean (X) = Σfm/N
= 620/22
= 28.18
Therefore, the mean is 28.18.
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