Question

the mean height of 10 girls in a class is 1.38metre and the mean height of the 40 is 1.44 metre find the mean height of 50 students of the class​

Answer 1

Answer:

1.428 m

Step-by-step explanation:

Let,

Sum of all the heights of girls = x

Sum of all the heights of boys = y

Mean height of:

10 girls = 1.38 m

40 boys = 1.44 m

Total students (50 students) = z

Mean height = Sum of all the heights / Number of students

From above formula,

1.38 m = x/10

x = 13.8 m

1.44 m = y/40

y = 57.6 m

Mean height of all the 50 students is then

z = (x + y) / 50

= (13.8 m + 57.6 m) / 50

= 71.4 m / 50

= 1.428 m

Answer 2

Answer:

x is equal to 13.8 metre

x is equal to 13.8 metrey is equal to 57.6 metre

x is equal to 13.8 metrey is equal to 57.6 metrez equal to (X + y)/50

x is equal to 13.8 metrey is equal to 57.6 metrez equal to (X + y)/50 z = ( 13.8 + 57.6)/50

x is equal to 13.8 metrey is equal to 57.6 metrez equal to (X + y)/50 z = ( 13.8 + 57.6)/5071.4/50 metres =1.428 metre