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Mathematics
Coefficient of variation
If the mean of few observations is $40$ and standard deviation is $8$, then what is the coefficient of variation?
a). $1\%$
b). $10\%$
c). $20\%$
d). $30\%$

Mathematics
Coefficient of variation
If the coefficient of variation and standard deviation are ${\text{60}}$ and ${\text{21}}$ respectively, then the arithmetic mean of the distribution is
$\left( 1 \right){\text{ }}60$
$\left( 2 \right){\text{ 3}}0$
$\left( 3 \right){\text{ 35}}$
$\left( 4 \right){\text{ 21}}$

Mathematics
Coefficient of variation
If $Var(x) = 8.25$, $Var(y) = 33.96$ and $Cov(x,y) = 10.2$ then the correlation coefficient is
$A)0.89$
$B) - 0.98$
$C)0.61$
$D) - 0.16$

Mathematics
Coefficient of variation
How do you construct a confidence interval for a correlation coefficient?

Mathematics
Coefficient of variation
The regression equation $y$ on $x$ is $y = \dfrac{2}{9}x$ and the regression equation of $x$ on $y$ is $x = \dfrac{y}{2} + \dfrac{7}{6}$ .
Find:
$\left( a \right){\text{ Correlation coefficient between x and y}}$
$\left( b \right){\text{ }}\sigma _y^2{\text{ if }}\sigma _x^2 = 4$
Mathematics
Coefficient of variation
The sum of squares of deviations for $10$ observations taken from mean $50$ is $250$. Then coefficient of variation is
A) $10\%$
B) $40\%$
C) $50\%$
D) None

Mathematics
Coefficient of variation
The following table is given the daily wages of workers in a factory. Compute the standard deviation and the coefficient of variation of the wages of the workers.
 Wages(in Rs.) 125-175 175-225 225-275 275-325 325-375 375-425 425-475 475-525 Number of workers 2 22 19 14 3 4 6 1

Mathematics
Coefficient of variation
JBG Ltd. budgets for fixed overhead of Rs. 24,000 and production of 4,800 units. Actual production is 4,200 units and fixed overhead cost incurred is Rs. 22,000. The fixed volume variance is:
(a) Rs. 3,000 (A)
(b) Rs. 2,000 (F)
(c) Rs. 1,000 (A)
(d) Rs. 3,000 (F)
Mathematics
Coefficient of variation
Calculate the coefficient of variation for the given data (36, 15, 25, 10, 14).

Mathematics
Coefficient of variation
The average run scored by a batsman in 15 cricket matches is 60 and the standard deviation of the runs is 15. Find the coefficient of variation of the runs scored by him.
Mathematics
Coefficient of variation
The mean and S.D of marks obtained by 50 students of a class in three subjects, mathematics, physics, and chemistry are given below:

Which of the three subjects shows the lowest coefficient of variation?

Mathematics
Coefficient of variation
Identify terms which contain $x$ and give the coefficient of $x$ in $7x + x{y^2}$
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