SOLUTION: Of the 538 people who had an annual check-up at a doctor’s office, 215 had high blood pressure. Estimate the probability that the next person who has a check-up will have high bloo

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Question 888025: Of the 538 people who had an annual check-up at a doctor’s office, 215 had high blood pressure. Estimate the probability that the next person who has a check-up will have high blood pressure.
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
If those first 538 people are representative of all the people that come to that doctor’s office for annual check-ups, then
215%2F538 of the people coming for annual check-ups have high blood pressure.
That is the probability that the next person who has a check-up will have high blood pressure:
215%2F538= approximately0.3996=%2239.96+%25%22 .
You could round that to 0.40=highlight%28%2240%25%22%29 .
(That may be the expected answer).
Since 0.4=2%2F5 , you could also say that the next person has a 2 in 5 chance of having high blood pressure.