Question 1168788
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(i)   P = 0.2*0.5 + 0.1*0.3 + 0.5*0.2 + 0.2*0.4.    (*)


      My formula is self-explanatory. I specially left it in this form in order for you could recognize its logic from its form.


     If you want to get the numerical value, use your calculator.



(ii) It is to determine the CONDITIONAL probability.


     The formula is


         P = {{{(0.5*0.2) /(0.2*0.5 + 0.1*0.3 + 0.5*0.2 + 0.2*0.4)}}}.


     In this formula, the numerator relates to functioning the camera L3.


     Looking into its denominator, recognize the formula (1) from part (i) above.
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