Prove with an example that Q. D. is the average difference of the quartiles from Median.
In order to prove that Q. D. is the average difference of the quartiles from median. We calculate Q1, Q3, Q.D and median from the following data :
20, 25, 29, 30, 35, 39, 41, 48, 51, 60 and 70.
Hence, it is proved Q.D. (here 11) is the average difference of the quartiles from the median.
If in the previous question, each worker is given a hike of 10% in wages, how are the mean and standard deviation values affected?
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.
Mock Test Series
