Question

Find the mean of a, b, c if :

- mean of a,b is 25
- mean of b,c is 28
- mean of a,c is 22

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Answer 1

Answer:

mean of a,b =25

a+b/2=25

a+b=50

b= 50-a (I)

mean of b,c = 28

b+c/2= 28

b+c =56

50-c=56

c=-6

mean of a,c =22

a+c/2=22

a+c=44

a+(-6)=44

a=50

from eq (I)

b= 0

mean of a,b,c = (50+0-6)/3

= 44/3

= 14.67