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For x1=2 x2=1.5 and x3=5 data drawn (iid) from f_x(x, theta)= [x^3 exp(-x/theta)]/[6 theta^4] when x>0...

For x1=2 x2=1.5 and x3=5 data drawn (iid) from f_x(x, theta)= [x^3 exp(-x/theta)]/[6 theta^4] when x>0 find the MLE for theta?

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