In an experiment to investigate the performance of four different brands of spark plugs intended for use on a 125-cc motorcycle, five plugs of each brand were tested, and the number of miles (at a co...
I Part b) (3 marks) The time between trains on a rail line at a specific level crossing is well approximated by an exponential distribution with a mean of 1.2 hours between trains. I spend two hours at a picnic site overlooking the level crossing. When I arrive, it has been 1 hour since the last train went by. I count trains as they cross. What is the probability I will have counted at least three trains before I leave?...
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Three different brands of tires were compared for wear characteristics. From each brand of tire, ten tires were randomly selected and subjected to standard wear-testing procedures. The average mileage and the sample standard deviation (both in 1000 miles) obtained for each brand of tire are shown below. The overall mean is 36. 2) Brand C | Brand A | Brand B Average Mileage37 Sample Variance 38 What are the numerical...