What is the summation of the product of the class mark and frequency?

To calculate the summation of the product of the class mark and frequency, follow these steps:

1. Identify the class marks: The class mark is the midpoint of each class or category in your data. It can be calculated by adding the lower and upper limits of the class and dividing by 2.

2. Identify the frequencies: The frequency is the number of times each class appears in your data.

3. Multiply each class mark by its corresponding frequency: This will give you the product of the class mark and frequency for each class.

4. Sum up all these products: The result is the summation of the product of the class mark and frequency.

This calculation is often used in statistics to find the weighted average or mean of a frequency distribution.