A test for marijuana usage was tried on 200200 subjects who did not use marijuana. the test result was wrong 77 times.
a. based on the available​ results, find the probability of a wrong test result for a person who does not use marijuana.
b. is it​ "unlikely" for the test to be wrong for those not using​ marijuana? consider an event to be unlikely if its probability is less than or equal to 0.05.