The gas mileages (in miles per gallon) for
cars are shown in the frequency distribution. Approximate the mean of the frequency distribution.
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The gas mileages (in miles per gallon) for 30 cars are shown in the frequency distribution. Approximate the mean of the frequency distribution.The approximate mean of the frequency distribution is _______ (Round to one decimal place as needed.)
The gas mileages (in miles per gallon) of 28 randomly selected sports cars are listed in the accompanying table. Assume the mileages are not normally distributed. Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. 囲Click the icon to view the sports car gas mileages. Let o be the population standard deviation and let n be the...
The gas mileages (in miles per gallon) of 25 randomly selected sports cars are listed in the accompanying table. Assume the mileages are not normally distributed. Use the standard normal distribution or the t-distribution to construct a 95% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. 20 31 17 20 19 24 17 23 25 21 21 30 17 22 23 24 21 24 21 18 19 19...
The average gas mileage of a certain model car is 29 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 2.4, find the probability that a car has a gas mileage of between 30 and 35 miles per gallon.
Gas mileage (measured in miles per gallon) of a new car model is normally distributed with a mean of 95 miles per gallon and a standard deviation of 17 miles per gallon. What is the median of this distribution? A.95 B.75 C.105 D.85 E.65
The combined gas mileage of mid-size cars varies with mean 25 miles per gallon (mpg) and a standard deviation of about 5.3 mpg. A particular rental car agency typically has 88 midsize cars in its lot. Assume the distribution of combined gas mileage of mid-size cars is Normal. Find the probability that the combined gas mileage for a randomly selected car in the lot is higher than 25 mpg. Find the probability that the mean combined gas mileage for all...
A certain model of automobile has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 26 mpg and a standard deviation of 4 mpg. Find the probability that a car selected at random has the following gas mileages. (Round your answers to four decimal places.) (a) less than 20 mpg (b) greater than 28 mpg (c) between 24 and 28 mpg
The manufacturer of a new car claims that miles per gallon for the gas consumption is normally distributed with a mean of 25.9 mpg and a standard deviation of 3.1 mpg. a.) If one car is tested, what is the probability that the mean mpg is less than 24 mpg? b.) If 30 cars are tested, what is the probability that the mean mpg is less than 24 mpg? c.) If one car is tested, what is the probability that...
A certain car model has a mean gas mileage of 34 miles per gallon with a standard deviation of 4 mpg. A pizza delivery conpany buys 54 of these cars. What is the probability that the average mileage of the fleet is between 33.3 and 34.3 mpg?
The accompanying data represent the weights of various domestic cars and their gas mileages in the city. The linear correlation coefficient between the weight of a car and its miles per gallon in the city is r = −0.978. The least-squares regression line treating weight as the explanatory variable and miles per gallon as the response variable is ŷ=−0.0067x+43.2680. Car Weight (pounds), x Miles per Gallon, y 1 3,765 18 2 3,984 17 3 3,530 21 4 3,175 23 5 ...