The mean finish time for a yearly amateur auto race was 185.45 minutes with a standard deviation of 0.313 minute. The winning car, driven by Perry, finished in 184.91 minutes. The previous year's race had a mean finishing time of 112.8 with a standard deviation of 0.116 minute. Th car that year, driven by Terry, finished in 112.47 minutes. Find their respective z-scores. Who had the more convincing victory? Perry had a finish time with a z-score of Terry had a finish time with a z-score of (Round to two decimal places as needed.)

Grace has a dog and its weight is z = -0.5lbs.  Her current weight is 47 lbs.  The average weight for medium-sized dogs is 50 lbs.  What is the standard deviation for a dog of her size?

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On a nationwide math test, the mean was 57 and the standard deviation was 4. If Roberto scored 90, what was his z-score?

A sandwich shop claims to sell subsandwiches that are 12 inches lona. An employee is alittle suspicious about this claim So over the course of the next week, he measures 45sandwiches at random. The mean and standard deviation for the 45 sandwiches is 12 18 inches

The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances that someone is earning more than $20 an hour?

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The local pilots association examined records from this year's census of its members. Tom is a member, and the census shows that he has 4210 hours of flight experience. The census also shows that among all members of the association the mean flight experience is 3095 hours with a standard deviation of 679 hours. Find the z-score of Tom's flight experience relative to the flight experiences of all the members of the pilots association. Round your answer to two decimal places.

The mean finish time for a yearly amateur auto race was 186.73 minutes with a standard deviation of 0.376 minute. The winning car, driven by Sam, finished in 186.25 minutes. The previous year's race had a mean finishing time of 112.4 with a standard deviation of 0.111 minute. The winning car that year, driven by Tammy, finished in 112.18 minutes. Find their respective z-scores. Who had the more convincing victory? Sam had a finish time with a z-score of Tammy had a finish time with a z-score of (Round to two decimal places as needed.)

The Acme Company manufactures widgets. The distribution of widget weights is bell shaped. The widget have a mean of 40 ounces and a standard deviation of 10 ounces. What percentage of the widget weights lie between 20 and 70 ounces?