1.

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?

Answer»

Solution :Coefficient of variation in maths
`=(SIGMA)/x XX 100=12/42xx100=28.57`
Coefficient of variation in physics
`=(sigma)/x xx 100=15/32xx100=46.875`
Coefficient of variation in CHEMISTRY
`=(sigma)/x xx 100=20/40.9xx 100=48.89`
Therefore, chemistry shows highest VARIABILITY and maths shows lowest variability.


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