Question

I'm a batch 280 water purifiers 12 were found to be defective what is the probability that a water purifier chosen at random will be defective

Answer 1

Total water purifiers = 280

Total defective ones = 12

P(defective) = 12/280 = 3/70

Answer: 3/70

Answer 2

You divide 280 with 12 and then say the probability of a water purifier at chosen is ... then instead of leaving your answer all alone ad a percentage (%) at the end. So it would be 23.3 %