If the mean height of 3 boys is
142 cm and the mean height of another
students 145cm. Then the mean reight
students is
Answers
Answered by
0
Step-by-step explanation:
Total height of 10 students =10×105=1050cm
Total height of 20 students =20×120=2400cm
∴ total height of 30 students =1050+2400=3450
Hence average height of 30 students =
30
3450
=115cm
Similar questions