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Find the mean deviation from the mean fo...

Find the mean deviation from the mean for the data: 6,7,10,12,13,4,8,20.

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`{(x_i,fi,x_i fi,f_i(x_i-bar x)^2),(6,2,12,338),(10,4,40,324),(14,7,98,175),(18,12,216,12),(24,8,192,200),(28,4,112,324),(30,3,90,376),(,,sumf_i=40,sumf_i*x_i=760):}`
mean `= 760/(40) = 19`
varience = `(sum f_i(x_i-bar x)^2)/(40) = 1736/(40) = 43.4`
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