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

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

a. .6232

b. .8421

c. .9736

d. .7888

e. .7226

Expert Solution

jeff jeffy answered 9 months ago

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