Given that the mean height of students in a class is 158 cms with S. D of 20cms. find how many students heights lie between 150cms and 170cms,if there are 100 students in the class.
Answers
Here's Ur Answer:-
Step-by-step explanation:
Sum of observations/ number of observations =mean
1)total students=100
Number of boys =60
Number of girls=40
2) mean height of 100 students=150
Sum of heights of the 100 students=150000----(1)
3) mean. Height of 60 boys =170
Sum of heights of 60 boys =170×60=10200----(2)
Sum of the heights of 40 girls =(1) -(2)
=15000-10200
=4800
Mean height of 40 girls = 4800/40
=120
✌️Hope it will help you ✌️
Step-by-step explanation:
Sum of observations/ number of observations mean
1)total students=100
Number of boys =60
Number of girls-40
2) mean height of 100 students=150
Sum of heights of the 100 students-150000-(1)
3) mean. Height of 60 boys =170
Sum of heights of 60 boys =170x60=10200---(2)
Sum of the heights of 40 girls =(1)-(2)
=15000-10200
=4800
Mean height of 40 girls = 4800/40
=120