JEE MATHEMATICS MCQ: STATISTICS

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Application +4 | -1

The average rate of (i) motion in the case of a person who rides the first mile at

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

, the next mile at

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

and the third mile at

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

(ii) increase in population which is the first decade has increased

20 \%

in the next

25 \%

and in the third

44 \%

are (where,

\log 20=1.3010

\log 25=1.3979, \log 28.02=1.4475

\log 44=1.6435

)

View answer and explanation

Correct option: C

7.66,28.02

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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