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Use the following results from a test for marijuana​ use, which is provided by a certain...

Use the following results from a test for marijuana​ use, which is provided by a certain drug testing company. Among 142 subjects with positive test​ results, there are 20 false positive results. Among 154 negative​ results, there are 5 false negative results.

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.)

Math   Statistics-And-Probability   
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