Question
State some important demerits of standard deviation.
✓
Answer
Some important demerits of standard deviation are:
- It is difficult to calculate as compared to other measures of dispersion.
- It is unduly affected by extreme values of the series as it is based on all the items.
- It cannot be used to compare two series expressed indifferent units.
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Marks
|
0-10
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10-20
|
20-30
|
30-40
|
40-50
|
50-60
|
60-70
|
|
No. of Students
|
5
|
10
|
20
|
25
|
20
|
10
|
5
|
Compute coefficient of correlation from the following data:
Sum of products of deviations of X and Y series from their respective mean is 20. Number of pairs of observations is 10.
|
|
X-seires
|
Y-series
|
|
Mean
|
15
|
28
|
|
Sum of Squares of deviations from mean
|
144
|
225
|