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Find the average marks obtained by 10 students in Maths (out of 20):
10, 16, 19.5, 12, 20, 16, 18, 13.5, 11, 15

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13.9

15.1

14.2

answer is B.

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Detailed Solution

The given marks obtained by 10 students are: 10, 16, 19.5, 12, 20, 16, 18, 13.5, 11, 15

Total of all the measurements=10 + 16 + 19.5 + 12 + 20 + 16 + 18+13.5+11+15

=151

No. of measurements= 10

∴ Average of all measurements = $\frac{151}{10} = 15.1$

Thus, the required average mark is 15.1

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