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In a class of 20 students, the average height is 150 cm. One student with a height of 155 cm joins the class. What is the new average height?
  1. 150 cm
  2. 150.24 cm
  3. 150.50 cm
  4. 151 cm
Explanation
Original total height = 20×150=3000 cm
New total height = 3000+155
=3155 cm
New number of students = 20+1
=21
New average = 3155÷21=
150.24 cm
Last updated 27-07-2026 by NA
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