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The mean and standard deviation of marks...

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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The correct Answer is:
Height Chemistry and lowest Mathematics
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