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Mathematics 21 Online
OpenStudy (anonymous):

In a swimming match, time distribution of 50-meters swimming has been normal and 65 percent of people have swam this route in less than 25 seconds and half of the people have swam this route in less than 23 seconds. a) How much is the average time of swimming this route? b) In less than how much seconds do 35 percent of people swim this route?

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