Q7 of 108 Page 32

The mean and standard deviation 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 highest variability in marks and which shows the lowest?


Coefficient variability =


Cv (Maths) =


Cv (Maths) = 28.57


Cv (physics) =


So, Cv (physics) = 46.87


Cv (chemistry) =


So, Cv (chemistry) = 48.89


Hence, Cv of chemistry is greatest, the variability of marks in chemistry is highest and that of Mathematics is lowest.


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