Company XYZ launches a new software which is tested using 4 independent tests. If there is an error, it will be discovered with probabilities 0.4, 0.1, 0.3 and 0.2 respectively. Suppose that the software does contain an error. What is the probability that it will be found

(a) By at least one test?

(b) All four tests?      

Answer rating: 100% (QA)

Let ABC D be error found by test 1234 respectively ... View the full answer