Question 390200
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Hi,        
Let x represent the number expected to be defective with 5000 cars
Question Sets Up the Proportion
 {{{5/150 = x/5000}}}
cross Multitplying to solve for x
 150x = 5*5000
    x = 5*5000/150
    x =  167, the number expected to be defective with 5000 cars