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?

122.1 cm

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