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In a city school of 900 students, 30% of the students are on the honor roll, 70% have a part-time job, and 25% are on the honor roll and have a part-time job. What is the probability (rounded to the nearest whole percent) that a randomly selected student is on the honor roll, given that the student has a part-time job?

 18%

 21%

 43%

 36%

 

Don't even know where to start...help

failurewithasmile  Apr 15, 2017
 #1
avatar+86883 
+1

Let H  = P(Honor roll)  =.30

Let J = P(Part-time Job)  = .70

P ( H and J)  =   .25

 

We want to find

 

P (H l J )   =    P(H and J)  / P(J)   =     .25  /  .70    =   .357   ≈   36 %

 

 

cool cool cool

CPhill  Apr 15, 2017

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