are there two different ways to find the mean? are there two different formulas to find mean?i have an assignmnet that has a formula for mean as Xbar, another one as efx/ef, and another one as xbar=sigma X/n.what are the difference? how do you know which formula to use when you see a question?

Question
Asked Sep 11, 2019

are there two different ways to find the mean? 

are there two different formulas to find mean?

i have an assignmnet that has a formula for mean as Xbar, another one as efx/ef, and another one as xbar=sigma X/n.

what are the difference? 

how do you know which formula to use when you see a question?

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Expert Answer

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Step 1

Yes, there are two ways to find the arithmetic mean, one for ungrouped data or raw data (given data is as individual observations) and another one for grouped data (given data divided as class intervals).

Ungrouped data:

The formula for mean of ungrouped data is,

Sum of all observati ons
Number of observations
Σx
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Sum of all observati ons Number of observations Σx

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Step 2

Example for raw data is 9, 5, 6, 8, 9, 10, 1, 3, 6, 15.

72
10
- 7.2
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72 10 - 7.2

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Step 3

Grouped data:

The formula for mean of ungrouped...

Σκ
7η
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Σκ 7η

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