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.