write two methods of calculating mean
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Answered by
1
Answer:
There are 3 methods of calculating mean
- Direct method
- Assumed mean method
- step deviation method
Step-by-step explanation:
I hope answer will help you
Answered by
1
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
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