The mean and standard deviation of marks obtained by 50 students of a class in three subjects, Mathematics, Physics and Chemistry are given below: Subject Mathematics Physics Chemistry Mean 42 32 40.9 Standard deviation 12 15 20 Which of the three subjects shows the highest variability in marks and which shows the lowest?

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Standard deviation of Mathematics = 12 Standard deviation of Physics = 15 Standard deviation of Chemistry = 20 The coefficient of variation (C.V.) is given by . The subject with greater C.V. is more variable than others. Therefore, the highest variability in marks is in Chemistry and the lowest variability...
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Standard deviation of Mathematics = 12 Standard deviation of Physics = 15 Standard deviation of Chemistry = 20 The coefficient of variation (C.V.) is given by . The subject with greater C.V. is more variable than others. Therefore, the highest variability in marks is in Chemistry and the lowest variability in marks is in Mathematics. read less
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