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Measures of Dispersion
In the previous question, calculate the relative measures of variation and indicate the value, which in your opinion is more reliable.
Co-efficient Of range is the relative measure of range. Hence we will calculate coefficient of range.
Co-efficient of Range of Wheat
Co-efficient of Range of Rice
In the same way, we will calculate co-efficient of quartile deviation and co-efficient of variation of both the crops.
Relative measure of variation is more reliable.
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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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