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Mathematics 9 Online
OpenStudy (anonymous):

The heights of 20-29 year old males in the US are approximately normal, with mean 70.4 inches and standard deviation 3.0 inches. a)If you select a male between ages 20 and 29 at random, whats the approximate probability that he is less than 68 inches tall? b)There are roughly 19 million 20 to 29 year old males, about how many are between 67 and 68 inches tall? c)Find the height of 20-29 year old males that falls at the 90th percentile. How would I go about finding these?

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