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(C) We know that the Coefficient of Variation ($C$.$V$.) is given by the formula:$C.V. = \frac{	ext{Standard Deviation}}{	ext{Mean}} 	imes 100$Calc

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Biology

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(C) We know that the Coefficient of Variation ($C$.$V$.) is given by the formula:$C.V. = \frac{	ext{Standard Deviation}}{	ext{Mean}} 	imes 100$Calculating the $C$.$V$. for each subject:$1. (C.V.)_{	ext{Physics}} = \frac{3}{20} = 0.15$$2. (C.V.)_{	ext{Chemistry}} = \frac{2}{25} = 0.08$$3. (C.V.)_{	ext{Mathematics}} = \frac{4}{23} \approx 0.174$$4. (C.V.)_{	ext{Biology}} = \frac{5}{27} \approx 0.185$Comparing the values,the highest variability is observed in Biology since it has the highest Coefficient of Variation $(0.185)$.

	Physics	Chemistry	Mathematics	Biology
Mean	$20$	$25$	$23$	$27$
$S$.$D$.	$3$	$2$	$4$	$5$

Class Interval	Frequency
$0 - 6$	$10$
$6 - 12$	$8$
$12 - 18$	$6$
$18 - 24$	$4$
$24 - 30$	$2$

The following table shows the information about marks obtained in Physics,Chemistry,Mathematics,and Biology by $100$ students in a class. Which subject shows the highest variability in marks?
Physics Chemistry Mathematics Biology
Mean $20$ $25$ $23$ $27$
$S$.$D$. $3$ $2$ $4$ $5$

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Class Interval Frequency
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$18 - 24$ $4$
$24 - 30$ $2$

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The following table shows the information about marks obtained in Physics,Chemistry,Mathematics,and Biology by $100$ students in a class. Which subject shows the highest variability in marks?PhysicsChemistryMathematicsBiologyMean$20$$25$$23$$27$$S$.$D$.$3$$2$$4$$5$