A test for a certain drug produces a false negative 4% of the time and a false positive 6% of the time. Supposed 19% of the employees at a certain company use the drug. If an employee at the company tests negative, what is the probability that he or she does not use the drug

0.806

Step-by-step explanation:

Given

4 % Test false negative i.e. Person is drug user but test is negative

so 96 % are drug user and should with positive test

6 % is false Positive i.e. Person is Non-druggist but test is showing positive

94 % are Non-druggist and test negative

If 19 % of employees use drug

so 100-19=81 % are non drug user

Probability(Employee uses drug if he tests negative)=P

You multiply the number by itself a specified number of times

Step-by-step explanation: