The mean and standard deviation of marks obtained by 50 students of a cl ass i n
three subjects physics, mathematics and chemistry are as follows:

Which of the subjects show the highest and lowest variabilities respectively?
🎥 Video solution / Text Solution of this question is given below:
Compare variability via coefficient of variation (CV) = SD / Mean.
Math: $12/42 \approx 0.286$
Physics: $15/32 \approx 0.469$
Chemistry: $20/40.9 \approx 0.489$
Highest CV → Chemistry; Lowest CV → Mathematics.
$\boxed{\text{Answer: (B) Chemistry, Mathematics}}$