Question 413911
To find P(1 < x &#8804; 4), simply add the probabilities from x=2 to x=4 (note: we are NOT including 1)


P(1 < x &#8804; 4) = P(x=2) + P(x=3) + P(x=4) 



P(1 < x &#8804; 4) = 0.15+0.15+0.25



P(1 < x &#8804; 4) = 0.55



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