A group of ASU Sustainability students took 2000 water samples from groundwater in different places in the Phoenix valley. They test those samples for a certain chemical. The test is not 100% correct. If the sample contains the chemical, the test shows a positive test results 98% of the time. If the sample does not contain the chemical, it give a negative result 96% of the time. If 150 groundwater samples contain chemicals, what is the probability the sample contains a chemical if you have a positive test return for the sample?

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