The average height of 15 students of a class is 136.5 cm. If one more student joins the average height becomes 135.6 cm. the height of the new student is?
Answer & explanation
Correct answer: option 3
Let the average height of 16th student = 135.6
Absolute average height of 15 students decreased by = (136.5 -135.6) × 15 = 0.9 × 15 = 13.5
Therefore,
Height of the 16th student = 135.6 - 13.5 = 122.1