Question 111
The average height of 30 students of a class is 165 cm. 5 new students with average height 172 cm join the class. What is the new average (in cm) of the class?
Solution
The total sum of heights of 30 students was 30 $$\times$$ 165, which is 4950 cm.
Now, 5 students with an average height of 172 cm joined the class, which makes the total height as 860+4950= 5810 cm.
The average height of the 35 students now will be $$\ \frac{\ 5810}{35}$$ = 166 cm.
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