SOLUTION: In a marathon, there is a half-marathon and a full-marathon. There are 60 students who participated in the half-marathon and 80 participated in the full-marathon. Half of the stude

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Question 1140147: In a marathon, there is a half-marathon and a full-marathon. There are 60 students who participated in the half-marathon and 80 participated in the full-marathon. Half of the students in the half-marathon warm up before the run, while three-quarters of the students in the full-marathon warm up. Assume that warming up and not warming up are mutually exclusive and complementary. What is the probability of randomly picking a marathon participant who does not warm up before running?
Answer by greenestamps(13200) About Me  (Show Source):
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half marathon: 60 runners; 30 warm up.

full marathon: 80 runners; 60 warm up.

total: 140 runners; 90 warm up.

The probability that a randomly selected runner warms up is 90/140.

Simplify or convert to decimal or percentage as needed.