In supervised digital image classification, the number of combinations to be evaluated to select three best bands out of five bands is _____________
The marks out of 50 obtained by 100 students in a test are given below:
| Marks obtained | 20 | 25 | 28 | 29 | 33 | 38 | 42 | 43 |
|---|---|---|---|---|---|---|---|---|
| Number of students | 6 | 20 | 24 | 28 | 15 | 4 | 2 | 1 |
Find: \(3\text{ mode} - 2\text{ median}\)