Question

In this chapter, you have studied the following points :
The mean for grouped data is calculated by:
1.
(1)
The direct method : x
fi
Σ/d,
The assumed mean method : x = a +
Σ f
The step deviation method : x=a+
Xh
Efi​

Answer 1

Step-by-step explanation:

To calculate the mean of grouped data, the first step is to determine the midpoint (also called a class mark) of each interval, or class. These midpoints must then be multiplied by the frequencies of the corresponding classes. The sum of the products divided by the total number of values will be the value of the mean