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Measures Of Dispersion Here is the CBSE Statistics Chapter 6 for Class 11 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 11 Statistics Measures Of Dispersion Chapter 6 NCERT Solutions for Class 11 Statistics Measures Of Dispersion Chapter 6 The following is a summary in Hindi and English for the academic year
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Which measure of dispersion is the best and how?
Standard deviation is the best measures of dispersion, because it posseses most of the characterstics of an ideal measure of dispersion.
A batsman is to be selected for a cricket team. The choice is between X and Y on the basis of their five previous scores which are:
|
X |
Y |
|
25 |
50 |
|
85 |
70 |
|
40 |
65 |
|
80 |
45 |
|
120 |
80 |
Which batsman should be selected if we want
(i) a higher run getter, or
(ii) a more reliable batsman in the team?
To check the quality of two brands of lightbulbs, their life in burning hours was estimated as under for 100 bulbs of each brand.
|
Life (in hrs) |
No. of bulbs |
||
|
Brand A |
Brand B |
||
|
0–50 |
15 |
2 |
|
|
50–100 |
20 |
8 |
|
|
100–150 |
18 |
60 |
|
|
150–200 |
25 |
25 |
|
|
200–250 |
22 |
5 |
|
|
100 |
100 |
||
(i) Which brand gives higher life?
(ii) Which brand is more dependable?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 |
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