Question

While computing mean of grouped data, we assume that the frequencies are

• A. Evenly distributed over all the classes
• B. Centred at the class marks of the classes
• C. Centred at the upper limits of the classes
• D. Centred at the lower limits of the classes

Answer 1

The correct option is B

Centred at the class marks of the classes

Explanation for the correct option.

• Mean is defined as the average of the given numbers.
• Mean is calculated as the sum of all the given data values divided by the total number of data values given in the set.
• In calculating the mean of grouped data, the frequencies are centred at the class marks of the classes.

So, while computing mean of grouped data, we assume that the frequencies are centred at the class marks of the classes

Hence, the correct option is $\mathrm{B}.$