find the mean of the following distribution
classes 25-29 30-34 35-39 40-44 45-49 50-54 54-59
frequency 14 22 16 6 5 3 2
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let the assume mean A= 42
class Mid value X D=x-42 U=x-42/5 f F u
25-29 27 -15 -3 14 -42
30-34 32 -10 -2 22 44
35-39 37 -5 -1 16 -16
40-44 42 0 0 6 0
45-49 47 5 1 5 5
50-54 52 10 2 3 6
55-59 57 15 3 4 12
N=70 F u=-79
A=42 , n=5
Mean=a+n x (f u / n)
=42+5(-79/70)
=42+(-395/70)
=42-5.643
=36.357
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