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<p align="justify">Arithmetic mean is the sum of the values divided by the number of values in the raw data. Arithmetic mean is also called simple mean because of its wide usage as a measure of central tendency. There is slight difference in the formulas in case of population data (grouped and ungrouped) and sample data (grouped and ungrouped). These formulas along with calculations are given below.</p>
<p align="justify">&#160;</p>
<h3>Population Ungrouped Data</h3>
<p align="justify">In order to calculate the mean of population having ungrouped data, the formula will be</p>
<p align="justify">&#160;</p>
<p align="justify"><a href="http://mba-lectures.com/wp-content/uploads/2010/05/image8.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="148" alt="image" src="http://mba-lectures.com/wp-content/uploads/2010/05/image_thumb8.png" width="400" border="0" /></a> </p>
<p align="justify">&#160;</p>
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<h3>Sample Ungrouped Data</h3>
<p align="justify">
The mean of sample having ungrouped data can be calculated with the help of following formula. </p>
<p align="justify">&#160;</p>
<p align="justify">&#160; <a href="http://mba-lectures.com/wp-content/uploads/2010/05/image9.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="145" alt="image" src="http://mba-lectures.com/wp-content/uploads/2010/05/image_thumb9.png" width="400" border="0" /></a> </p>
<p><strong>Problem:</strong>&#160; Following are the number of hours of 10 people who work in same organization. 10, 17, 12, 10, 14, 9, 8, 3, 14, 16 Calculate Arithmetic Mean. (A) Treat data as a population (B) Treat data as a sample. </p>
<p align="justify">&#160;</p>
<p> <a href="http://mba-lectures.com/wp-content/uploads/2010/05/image10.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="365" alt="image" src="http://mba-lectures.com/wp-content/uploads/2010/05/image_thumb10.png" width="500" border="0" /></a> </p>
<p> &#160;</p>
<h3>Population grouped Data</h3>
<p> The formula for calculating the mean of population having grouped data is given below.</p>
<p> &#160;</p>
<p> <a href="http://mba-lectures.com/wp-content/uploads/2010/05/image11.png"><img title="image" style="border-top-width: 0px; display: inline; border-left-width: 0px; border-bottom-width: 0px; border-right-width: 0px" height="184" alt="image" src="http://mba-lectures.com/wp-content/uploads/2010/05/image_thumb11.png" width="500" border="0" /></a> </p>
<p> &#160;</p>
<h3>Sample grouped Data</h3>
<p> The mean of sample having grouped data can be calculated with the help of following formula.
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