Find the mean of the following frequency distribution: Classes:               0-20         20-40                            40-60       60-80                            80-100 Frequency:          15            18                            21            29                            17

Explanation

To find the mean of the given frequency distribution, we will follow these steps:

### Step 1: Create a table for the frequency distribution
We will list the classes and their corresponding frequencies.

| Class | Frequency (f) |
|-----------|---------------|
| 0 - 20 | 15 |
...