Which one of the following subjects shows highest variability of marks ?
Consider the following for the next two (02) items that follow : The mean and standard deviation (SD) of marks obtained by 50 students of a class in 4 subjects are given below : <table> <thead><tr><th>Subject</th><th>Mathematics</th><th>Physics</th><th>Chemistry</th><th>Biology</th></tr></thead> <tbody> <tr><td>Mean Marks</td><td>40</td><td>28</td><td>38</td><td>36</td></tr> <tr><td>SD</td><td>15</td><td>12</td><td>14</td><td>16</td></tr> </tbody> </table>
- A. Mathematics
- B. Physics
- C. Chemistry
- D. Biology ✓
Correct Answer: D. Biology
Explanation
Variability is compared using the Coefficient of Variation, CV = \frac{SD}{\text{Mean}} \times 100. For Mathematics it is 37.5\%, Physics is \approx 42.8\%, Chemistry is \approx 36.8\%, and Biology is \approx 44.4\%. Biology has the highest CV.
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