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Apply step-deviation method to find the `A M` of the following frequency distribution Variate(x) 5 10 15 20 25 30 35 40 45 50 Frequency(f) 20 43 75 67 72 45 39 9 8 6

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assume that mean be `A=25` and `h=5`
mean,
We have
`N=384,A=25,h=5` and `sum f_i u_i=-214`
...
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