Subject :IMO Class : Class 10

The mean height of the 10 girls of a class is 1.4 m and the mean height of the 30 boys of the class is 1.45 m. Find the approximate mean height of the 40 students of the class.

(a) 1.39 m

(b) 1.46 m

(c) 1.42 m

(d) 1.44 m