Question

A local grocery store tested spinach samples for E coli bacteria using two different tests. The first test has a 94% probability of giving accurate results, while the second test is accurate 89% of the time. A sample that contains E coli bacteria is tested. The probability that both tests detect the bacteria is -----%

Answer 1

as a percentage- 83.66%

Answer 2

If you add the numbers then divide you get 91.5%. Not sure if that is the correct way to do it though. Sorry if it’s not.