Find the mean deviation about the mean for the following data: Marks obtained 10-20 20-30 30-40 40-50 50-60 60-70 70-80 Number of students 2 3 8 14 8 3 2

Explanation

To find the mean deviation about the mean for the given data, we will follow these steps:

### Step 1: Create a frequency distribution table
We will list the class intervals and the corresponding number of students (frequencies).

| Marks Obtained | Number of Students (f) |
|----------------|------------------------|
| 10 - 20 | 2 |
...