Calculate standard deviation from the given values directly Le. without taking deviations. Values : 5, 10, 25, 30, 50.
Calculation of standard deviations directly i.e. without taking deviations:
|
X |
X2 |
|
5 |
25 |
|
10 |
100 |
|
25 |
625 |
|
30 |
900 |
|
50 |
2500 |
|
ΣX = 120 |
ΣX2 = 4150 |
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.
Give formula to calculate standard deviation of a frequency destribution series by direct method.
Mock Test Series
