Question

the average height of 50 pupils in a class is 150 cm. five of them whose height is 146 cm leave the class and five others whose average height is 156 cm join. the new average height of the pupils of the class (in cm) is

Answer 1

$\textbf {Hey there, here is the solution.}$

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Find the sum of the height of the 50 pupils:

Sum of their height = 50 x 150 = 7500 cm

Find the sum of of the height of the 5 that left:

Sum of the height of the 5 pupils = 5 x 146 = 730 cm

Find the sum of the height of the 5 that joined:

Sum of the height of the 5 pupils = 5 x 156 = 780 cm

Find the sum of the height of the pupils now:

7500 - 730 + 780 = 7550 cm

Find the average height of the 50 pupils:

7550 ÷ 50 = 151 cm

Answer: The average height of the pupil is 151 cm

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⭐$\textbf {Cheers}$⭐