/25/12 Math10 Summer 2012: LAB 2
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LAB 2 - Attempt 1
1 With the fluctuation of gas prices today, the mileage ratings of vehicles is of Marks: 2 importance to most drivers. However, the ratings advertised by car manufacturers may not bear any relationship to what you get, depending on where, when, and how you drive. Nevertheless, the Environmental Protection Agency (EPA) spends countless hours collecting and analyzing data to determine estimated mileage ratings. The EPA places vehicles on a device called a dynamometer— sort of like a great big "treadmill" for cars where every car is put through the same routine of accelerating, braking, coasting, stopping, and switching the engine on and off. The mileage obtained during that standard cycle is then adjusted by a numerical factor to get it closer to "real world" experience. Starting with the 2008 model year, the EPA revised those tweaks to bring hybrid mileage ratings closer to actual usage. The 2009 Toyota Prius Hybrid car is advertised as having an overall mileage rating of 48 miles per gallon (mpg) for city driving, and 45 mpg for highway driving. In fact, it turns out that the actual 2009 Prius overall mileage ratings are approximately Normally Distributed with a mean of 47 mpg and a standard deviation of 2.1 mpg. QUESTION TO ANSWER: If you were to randomly select a 2009 Prius, what is the probability that it gets at least 50 mpg? (Round your answer to 4 decimal places. Do NOT include units. Do NOT include any letters, spaces, commas, or any characters other than numbers.)
Answer:
2 Forty 2009 Prius vehicles were randomly sampled and their mileage ratings were Marks: 1 recorded. The data are displayed in the table below.
43 43 44 44 44 45 45 45 45 45 45 46 46 46 46 46 46 46 46 46 47 47 47 47 47 47 47 47 48 48 4 8 4 8 4 8 4 9 4 9 4 9 4 9 50 5 0 51
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