Question

(O) year
56. There are 50 students in a class. The average height of 30 students is 160
cm. and the average height of the remaining students is 155 cm. Find the
average height of all the students of the class.


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Answer 1

Answer:

136

Explanation:

Avg height of 30 boys = 160 cm

Since avg = sum of all heights/number of boys

sum of heights of 30 boys = 30x160 = 4800cm

remaining boys = 50–30 = 20

avg height of 20 boys = 100 cm

using the same logic as above, sum of heights of 20 boys = 20x100 = 2000cm

Therefore, sum of heights of all boys aka 50 boys = 4800+2000

=6800cm

avg height of 50 boys = total sum/50

= 6800/50 = 136cm

Answer 2

Explanation:

Answer of this question is 158