Question 1200040
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(1)  The probability that three rotator cuff surgeries are successful is  

         P = 0.9*0.9*0.9 = {{{0.9^3}}} = 0.729.    <U>ANSWER</U>



(2)  The probability that none of the three rotator cuff surgeries are successful is

         P = (1-0.9)*(1-0.9)*(1-0.9) = 0.1*0.1*0.1 = {{{0.1*3}}} = 0.001.    <U>ANSWER</U>




(3)  The probability that at least one of the three rotator cuff surgeries is successful is

         P = 1 - 0.1*0.1*0.1 = 1 - 0.001 = 0.999.    <U>ANSWER</U>
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Solved.  All the formulas are self-explanatory.