Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 148 subjects with positive test results, there are 21 false positive results. Among...

Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among 148
subjects with positive test results, there are 21 false positive results. Among 155 negative results, there are 3 false negative
results. Complete parts (a) through (c).


a. How many subjects were included in the study?
The total number of subjects in the study was .
b. How many subjects did not use marijuana?
A total of 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 .
(Do not round until the final answer. Then round to three decimal places as needed.)