Saved Bookmarks
| 1. |
3. Average height of 15 students of class 6 is 140 cm and average height of 10 students of class 7 is 145 cm.What is the average height of the students of both the classes? |
|
Answer» your answer is 142 cm please mark as best class 615*140=2100class 710*145=1450then, a/q .2100+1450=3550 Total no of student =15+10=25Total height of the 6 class student =140×15=2100cmTotal height of 7 class student =145×10=1450cmThen total height of class 6&7 students =2100+1450=3550cmAverage height =Total height/Total student Average height =3550cm/25=142cm. (ans) the correct answer is 11.4cm class 615*140=2100class710*145=1450then,2100+1450=35503550/10+153550/25=142 |
|