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Step-by-step explanation:
mean is given as
(1/N)sigma[i=0 to n](xf)=x0f0+x1f1+x2f2+x3f3)/N
=0+1*5+2*4+3*1=5+8+3=16/N
N=4
mean=16/4=4
mean deviation=(xi-mean)
(0-4)+(1-5)+(2-4)+(3-1)/N=4+4+2+2/4=12/4=3
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