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If the mean of the following distributions 54, find the value of `p :` Class: 0-20 20-40 40-60 60-80 80-100 Frequency: 7 `p` 10 9 13

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we have
`A=50,N=39+p, sum f_i u_i=21-p ` and `bar X=54`
Mean=`A+h(1/n sum f_i u_i)`
`54=50+20X((21-p)/(39+p))`
...
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