Question

write two methods of calculating mean​

Answer 1

Answer:

There are 3 methods of calculating mean

1. Direct method
2. Assumed mean method
3. step deviation method

Step-by-step explanation:

I hope answer will help you

Answer 2

Answer:

ditect method and assumption mean method and third is step deviation method

Step-by-step explanation:

Assumed Mean Method Formula

Let x1, x2, x3,…,xn are mid-points or class marks of n class intervals and f1, f2, f3, …, fn are the respective frequencies. The formula of the 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

. Direct Method

In this method, the formal definition of mean is used. The values of items are simply summed and divided by the number of observations.

Mean=∑X÷N

where N is sum of frequencies