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Calculations :
i) Median (Me) = Size of 
= Size of 11th item.
Therefore, Median ( Me) = 8
ii) M. D. = 
Example ( Continuous series ) Calculate the mean deviation and the coefficient of mean deviation from the following data using the mean.
Difference in ages between boys and girls of a class.
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Diff. in years: |
No.of students:
|
|
0 - 5 |
449 |
|
5 - 10 |
705 |
|
10 - 15 |
507 |
|
15 - 20 |
281 |
|
20 - 25 |
109 |
|
25 - 30 |
52 |
|
30 - 35 |
16 |
|
35 - 40 |
4 |
Click here to enlarge
Calculation:
1) X 
2) M. D. 
3) co - efficient of M. D. 
[next page]
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Index
5.1 Introduction
5.2 Methods of computing dispersion
5.3 Range
5.4 Mean Deviation
5.5 Variance
5.6 Coefficient of Variation
5.7 Percentile
5.8 Quartiles and interquartile range
5.9 Skewness moments and Kurtosis
5.10 Kurtosis
Chapter 6
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