The average height of 30 boys out of a class of…

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The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is :

  1. A. 161
  2. B. 162
  3. C. 163
  4. D. 164

Answer: Option B

Here is complete explanation of The average height of 30 boys out of a class of….

Solution(By ExamCraze Team)

Average height of the whole class
$$eqalign{ & = frac{{30 times 160 + 20 times 165}}{{50}} cr & = frac{{3 times 160 + 2 times 165}}{5} cr} $$
= 96 + 66
= 162 cm

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