QUESTION 10 Suppose the average tread-life of a certain brand of tire is 42,000

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QUESTION 10 Suppose the average tread-life of a certain brand of tire is 42,000 miles and that this mileage follows the exponential probability distribution. What is the probability that a randomly selected tire will have a tread-life between 30,000 and 50,000 miles? 0.1854 0.2719 0.5105 0.6959 QUESTION 11 2 points Save The time for a professor to grade an exam is normally distributed with a mean of 12.6 minutes and a standard deviation of 2.5 minutes. What is the probability that a randomly selected exam will require less than 16 minutes to grade? 0.1401 0.5910 0.7734 0.9131 QUESTION 12 League Baseball season, the Baltimore Orioles averaged 21,943 fans per home game. Suppose attendance during the season follows during the 2011 season the normal probability distribution with a standard deviation of 3,981 per game. What is the probability that a randomly selected game had an attendance greater than 30,000 people? 0.0217 O0.1492 0.3051 0.3936 QUESTION 13

Explanation / Answer

10)P(30000<X<50000)=e-30000/42000-e-50000/42000 =0.1854

11)

12)

for normal distribution z score =(X-)/ here mean=       = 12.600 std deviation   == 2.5000

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