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The speed of college tennis player Jaron Jackson's first serve averages 125 mph, with a standard deviation of 4 mph. The distribution of Jaron's serve

The speed of college tennis player Jaron Jackson's first serve averages 125 mph, with a standard deviation of 4 mph. The distribution of Jaron's serve speed is normal. How fast does a serve have to be to be among the fastest 20 percent of Jaron's serves?

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