Question

average height of 50 students of class 6 is 140 cm and average height of 10 students of class 7th is 145 cm what is the average height of the students of both the classes

Answer 1

‍‍‍‍‍‍class 6 :- 50x140 = 7000cm

‍‍‍‍class 7:- 10x145 =1450 cm

Overall height :-7000+1450 = 8450cm

8450/60 = 140.83 cm
average height of each student is ©©140.83 cm