Question

can anyone write formulas of three method to find mean
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Answer 1

Answer:

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The three approaches towards calculating mean for frequency distribution series are as follows:

Direct Method. In a frequency distribution, instead of individual values of observations, classes are mentioned. ...

Assumed Mean Method. ...

Step-Deviation Method.

Explanation:

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Answer 2

Answer:

☆Arithmetic Mean by Direct Method - formula

∑i=1nf= Sum of all the frequencies. This is also denoted by N. ∑i=1nfixi= Sum of the product of frequencies and corresponding observations.

☆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: = Attachment..

☆STEP DEVIATION METHOD...

= Attachment