Question

The average height of 7 girls of a class is 145 cm. The heights of first four girls are 138 cm, 142 cm, 147 cm and 135 cm. Find the average height of the remaining three girls of the class. ​

Answer 1

Answer:

ANSWER

Average height of 30 boys is 150㎝

Total height =30×150

=4500㎝

One value is copied 135㎝ which was 165㎝

So, total =4500+165−135

=4530

So, correct mean =

30

4530

=151㎝$$