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Question

The average height of a class of 40 is 156 cm. If one person leaves and the class and the average height decreases by 0.2 cm, what is the height of the person who left?

A
163.8 cm
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B
164.2 cm
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C
166 cm
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D
164 cm
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Solution

The correct option is A 163.8 cm
Sum of heights of 40 students =40×156=6240 cm
Sum of heights after the person left =39×155.8=6076.2 cm
Height of the person who left = 6240-6076.2 = 163.8 cm

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