Question

While calculating the mean of a given data by assumed mean method the following values were obtained A=25 Efidi=110 Efi =50 find the

Answer 1

Answer:

Let x1, x2, x3,…,xn are mid-ponts or class marks of n class intervals and f1, f2, f3, …, fn are the respective frequencies. The formula of assumed mean method is:

Assumed mean formula

Here,

a = assumed mean

fi = frequency of ith class

di = xi – a = deviation of ith class

Σfi = n = Total number of observations

xi = class mark = (upper class limit + lower class limit)/2

The value for a will be taken one among xi’s with the assumption that the frequency of a class is centred at its mid-point, called its class mark.

Step-by-step explanation: