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Measures of Dispersion
You are given the following heights of boys and girls:
|
Boys |
Girls |
|
|
Number |
72 |
38 |
|
Average height in inches |
68 |
61 |
|
Variance of distribution in inches |
9 |
4 |
1. Calculate coefficient of variance.
2. Calculate whose height is more variable.
(a) Calculation of Coefficient of variance of boys: 
(b) Calculation of Coefficient of Variance of girls :
Height of boys is more variable as their coefficient variance is more.
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The sum of 10 values is 100 and the sum of their squares is 1090. Find the coefficient of variation.
Calculate the mean deviation about mean and standard deviation for the following distribution:
|
Classes |
Frequencies |
|
20–40 |
3 |
|
40–80 |
6 |
|
80–100 |
20 |
|
100–120 |
12 |
|
120–140 |
9 |
|
50 |
A measure of dispersion is a good .supplement to the central value in understanding a frequency distribution. Comment
Define dispersion.
How many methods are there to calculate dipersion?
Define range.
Define quartile deviation.
How is coefficient of quartile deviation calculated?
Define mean deviation.
Define standard deviation.
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