Question

(3 points) In its Fuel Economy Guide for 2008 model vehicles, the Environmental Protection Agency gives data on 1152 vehicles. There are a number of outliers, mainly vehicles with very poor gas mileage. If we ignore the outliers, however, the combined city and highway gas mileage of the other 1120 or so vehicles is approximately Normal with mean 18.7 miles per gallon (mpg) and standard deviation 4.3 mpg The 2008 Chevrolet Malibu with a four-cylinder engine has combined gas mileage 25 mpg. What percent of all vehicles have worse gas mileage than the Malibu? How high must a 2008 vehicle's gas mileage be in order to al in the top 10% o a vehicies? he distr bu on omit s a e high outi er maini y rid gas electric vehicles. The quartiles of any distribution are the values with cumulative proportions 0.25 and 0.75. They span the middle half of the distribution. What are the quartiles of the distribution of gas mileage? Gas mileage of the first quartile Gas mileage of the third quartile The quintiles of any distribution are the values with cumulative proportions 0.20, 0.40, 0.60, and 0.80. What are the quintiles of the distribution of gas mileage? Gas mileage of 0.20 of the distribution: Gas mileage of 0.40 of the distribution: Gas mileage of 0.60 of the distribution Gas mileage of 0.80 of the distribution: (1 point) Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with μ = 96 and σ-21 (a) What proportion of children aged 13 to 15 years old have scores on this test above 86? (NOTE: Please enter your answer in decimal form. For example, 45.23% should be entered as 0.4523.) Answer: (b) Enter the score which marks the lowest 25 percent of the distribution. Answer: (c) Enter the score which marks the highest 5 percent of the distribution Answer:

Answer 1

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6 X- 18-7 -1.674- χ-18. - 18, 구 0,253

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