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प्रश्न
What is dispersion?
उत्तर
The term, ‘dispersion’, refers to the scattering of scores about the measure of central tendency. It is used to measure the extent to which individual items or numerical data tend to vary or spread about an average value. Thus, to get a better picture of distribution, we need to use a measure of central tendency and of dispersion or variability.
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संबंधित प्रश्न
Calculate the quartile deviation and its coefficient from the following data:
| Age in Years: | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
| No. of Members: | 13 | 61 | 47 | 15 | 10 | 18 | 36 |
Calculate quartile deviation and its relative measure from the following data:
| X | 0 - 10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 |
| f | 5 | 10 | 13 | 18 | 14 | 8 |
Compute mean deviation about median from the following data:
| Height in inches | No. of students |
| 58 | 15 |
| 59 | 20 |
| 60 | 32 |
| 61 | 35 |
| 62 | 35 |
| 63 | 22 |
| 64 | 20 |
| 65 | 10 |
| 66 | 8 |
Compute the mean deviation about mean from the following data:
| Class Interval: | 0 - 5 | 5 - 10 | 10 - 15 | 15 - 20 | 20 - 25 |
| Frequency (f) | 3 | 5 | 12 | 6 | 4 |
Find out the coefficient of mean deviation about median in the following series.
| Age in years | 0 - 10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 | 60 - 70 | 70 - 80 |
| No. of persons | 8 | 12 | 16 | 20 | 37 | 25 | 19 | 13 |
If Q1 = 30 and Q3 = 50, the coefficient of quartile deviation is
If median = 45 and its coefficient is 0.25, then the mean deviation about median is
Calculate the Mean deviation about median of the following data.
| Class interval: | 0 - 10 | 10 - 20 | 20 - 30 | 30 - 40 | 40 - 50 | 50 - 60 |
| Frequency: | 6 | 7 | 15 | 16 | 4 | 2 |
Calculate Mean deviation about Mean of the following data.
| X | 2 | 5 | 6 | 8 | 10 | 12 |
| f | 2 | 8 | 10 | 7 | 8 | 5 |
Calculate Quartile deviation and Coefficient of Quartile deviation of the following data.
| Marks: | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 |
| No. of students: | 150 | 142 | 130 | 120 | 72 | 30 | 12 | 4 |
