The average height of 22 students of a class is 140 cm and the average height of 28 students of anot...........

Quantitative Aptitude (CDS) Average

The average height of 22 students of a class is 140 cm and the average height of 28 students of another class is 152 cm. What is the average height of students of both the classes?

144.32 cm

145.52 cm

146.72 cm

147.92 cm

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Explanation:

Given average height of 22 students of a class is 140 cm
∴ total height of 22 students = 22×140=3080
And average height of 28 students of another class is 152 cm
$\therefore$ total height of 28 students = 28 x 152 = 4256
Now average height of of total students = (Height of total students) / number of total students = 7336 / 50 = 146 .72