The average height of each student in a class of 36 students is 169 cm. If 4 new students joined the class, then the average height of the each student in the class increases by 9 cm. Find the average height of 4 new students who joined the class.
Total height of 36 students of the class = 169 × 36 = 6084 cm When 4 new students joined the class, average height of each student = 169 + 9 = 178 cm Total height of 40 students of the class = 178 × 40 = 7120 cm Average height of 4 new students who joined the class = {(7120 – 6084)/4} = 1036/4 = 259 cm
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