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 nothing. ​(Do not round until the final answer. Then round to three decimal places as​ needed.

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