Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 145 subjects with positive test results, there are 22 false positive results. Among 153 negative results, there are 3 false negative results. Complete parts (a) through (c). (Hint: Construct a table.)
a. How many subjects were included in the study?
The total number of subjects in the study was 298.
b. How many subjects did not use marijuana?
A total of 172 subjects did not use marijuana.
c. What is the probability that a randomly selected subject did not use marijuana?
The probability that a randomly selected subject did not use marijuana is 0.577. (Do not round until the final answer. Then round to three decimal places as needed.)