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30. The speed of college tennis player Jaron Jacksons first serve averages 125 mph, with a standard deviation of 4 mph. If the distribution of

30. The speed of college tennis player Jaron Jacksons first serve averages 125 mph, with a standard deviation of 4 mph. If the distribution of service speeds is normal, what proportion of Jarons serves will be between 120 and 130 mph?

a. .6232

b. .8421

c. .9736

d. .7888

e. .7226

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