EASY
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Calculate coefficient of mean deviation about mean for the following data:

7,4,10,9,15,12,7,9,9,18

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Important Questions on Measures of Dispersion

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For a given distribution the arithmetic mean is 15 and the standard deviation is 9 then the coefficient of variation is equal to
MEDIUM
What will be the probable value of mean deviation when Q3=40 and Q1=15?
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The mean of a distribution is 14 and the standard deviation is 5. What is the value of the coefficient of variation?
MEDIUM
The average runs scored by a batsman in 15 cricket matches is 60 and standard deviation of the runs is 15. Find the coefficient of variation of the runs scored by him.
MEDIUM

The marks obtained by students A and B in 3 examinations are given below

Marks of A 30 20 40
Marks of B 70 0 5

The ratio of the coefficient of variation of marks of A and the coefficient of variation of marks of B is

MEDIUM
Coefficient of variation of two distributions are 50 and 60 and their arithmetic means are 30 and 25, respectively. Difference of their standard deviation is
MEDIUM
If the numbers are 5,1,8,7,2, then the coefficient of variation is
MEDIUM
Coefficient of variation of two distributions are 60 and 70, and their standard deviation are 21 and 16, respectively. What are their arithmetic means?
MEDIUM
Coefficient of variation of two distributions are 60 and 70 and their standard deviations are 21 and 16 respectively. Then their AM's are
MEDIUM
The means of two groups of observations A and B are x, y respectively and their standard deviations are respectively 2 and 3. In order that the group A is to be more consistent than the group B, yx<
EASY
All the students of a class performed poorly in Mathematics. The teacher decided to give grace marks of 10 to each of the students. Which of the following statistical measures will not change even after the grace marks were given ?
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The mean of two sample sizes 50 and 100 respectively are 54.1 and 50.3. Find the mean of the sample size of 150 obtained by combining the two samples(up to one decimal).
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 The coefficient of variation is independent of units.
EASY

Calculate coefficient of mean deviation about mean for the following data:

7,9,12,15,5,4,11

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A good measure of dispersion should be based on all the observations of the series.
MEDIUM

What are the requisites of a good measure of variation?

EASY

Find the Coefficient of mean deviation from median of observations 40,62,54,90,68,76.

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A good measure of dispersion should be capable of further mathematical treatment and statistical analysis.
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A good measure of dispersion should not be unduly affected by sampling fluctuations.