JEE MATHEMATICS MCQ: STATISTICS

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A motor car when travelling from rest travels the first twentieth of a mile at

6 \mathrm{~m} / \mathrm{h}

the next three twentieths of the mile at

8,12,24 \mathrm{~m} / \mathrm{h}

respectively. But its average speed over the first one-fifth of a mile is not

12.5 \mathrm{~m} / \mathrm{h}

, then the correct average is

View answer and explanation

Correct option: A

9.6 \mathrm{~m} / \mathrm{h}

Option C (7.66, 28.02) is correct because it calculates the harmonic mean for the speeds and the geometric mean for the population increases.

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