railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Elementary Statistics
The following table shows the number of studies of particular ages in a class of 40 students. Find the mean age of the students.
| Age in years (x) | 15 | 16 | 17 | 18 | 19 | 20 |
| No. of students (f) | 3 | 8 | 10 | 10 | 5 | 4 |
1
15.45
2
16.35
3
17.45
4
18.25