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30. The speed of college tennis player Jaron Jackson’s first serve averages 125 mph, with a...

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Finance

30. The speed of college tennis player Jaron Jackson’s firstserve averages 125 mph, with a standard deviation of 4 mph. If thedistribution of service speeds is normal, what proportion ofJaron’s serves will be between 120 and 130 mph?

a. .6232

b. .8421

c. .9736

d. .7888

e. .7226

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30. The speed of college tennis player Jaron Jackson’s firstserve averages 125 mph, with a standard deviation of 4 mph. If thedistribution of service speeds is normal, what proportion ofJaron’s serves will be between 120 and 130 mph?a. .6232b. .8421c. .9736d. .7888e. .7226

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