A truth serum given to a suspect is known to be 86 percent reliable when the person is guilty and 98 percent reliable when the person is innocent. In other words, 14 percent of the guilty are judged innocent by the serum and 2 percent of the innocent are judged guilty. If the suspect was selected from a group of suspects of which only 9 percent are guilty of having committed a crime, and the serum indicates that the suspect is guilty of having committed a crime, what is the probability that the suspect is innocent?

i'm not sure i quite understand, could you provide more information?

i got 142 as my answer

step-by-step explanation:

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation: