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IPMAT Indore 2022 - QA (MCQ) Q31 Explanation
December 28, 2024
Explanation:
(c)
Average = Sum of observaitons/Number of observations
Sum of heights of n persons = Average height × Number of persons
= 160 × 𝑛.
Similarly, sum of heights of ‘m’ persons = 172 × m Average height of all persons
= Sum of height all the persons/Total number of persons
164 = 160n+172 m/m+n
⇒ 164(𝑚+𝑛) = 160𝑛 + 172𝑚
= 4n = 8m
⇒ 𝑚/𝑛 = 4/8 = 1/2
m : n = 1 : 2