The mean of the following frequency dristibution is 50. Find the value of p

Class 0 - 20 20 - 40 40 - 60 60 - 80 80 - 100
Frequency 17 28 32 p 19

 class intervals frequency (fi)   xi  di = xi - A fi di
 0 - 20 17 10 -40 -680
 20 - 40 28 30 -20 -560
40 - 60 32 50  =  A 0 0
60 - 80 p 70 20 20p
80 - 100 19 90 40 760
 totalΣ  fi = 96 + p   Σ  fi di  = 20p - 480

 

  • 6

Mean =f1-f0/2f1-f0-f2

f1=32

F0=28

F2=p

Mean = 50

50=32-28/2(32)-28-p 

 

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