Question

- The Environmental Protection Agency rates the mean highway gas
mileage of the 2017 Chevrolet Sonic to be 28 miles per gallon.
Assume the standard deviation is 3 miles per gallon. A rental car
company buys 50 of these cars.
- What is the probability that the mean gas mileage of the rental fleet is less than 27.5 miles per gallon?
- Find the 70th percentile of the mean mileage for the rental fleet. Round your answer to two decimal digits.

Answer #1

The Environmental Protection Agency (EPA) rates the mean highway
gas mileage of the 2017 Chevrolet Sonic to be 28 miles per gallon.
Assume the standard deviation is 3 miles per gallon. A rental
company bought 60 of these cars.
a. What is the probability that the average mileage of the fleet
is greater than 27.5 miles per gallon?
b. What is the probability that the average mileage of the fleet
is between 27 and 27.8 miles per gallon?
c. What...

A certain car model has a mean gas mileage of 31 miles per
gallon (mpg) with a standard deviation 3 mpg. A pizza delivery
company buys 43 of these cars. What is the probability that the
average mileage of the fleet is greater than 30.7 mph

A certain car model has a mean gas mileage of 31 miles per
gallon (mpg) with astandard deviation 3 mpg. A pizza delivery
company buys 43 of these cars. What is theprobability that the
average mileage of the fleet is greater than 30.7 mpg?

The Environmental Protection Agency
measures a mean gas mileage for recently tested cars as 24.8 mpg
with a standard
deviation of 6.2 mpg. The dataset
on Fuel economy in StatCrunch gives an average of
24.2 mpg with a standard deviation of 6.5 mpg. Joe’s car is
estimated at 30 mpg.
(a) Calculate the z-scores to find the relative tab at both
sources (the Exercise and
the Dataset).
(b) Relative to the other cars,
with which source will Joe have
the...

In its Fuel Economy Guide for 2014 model vehicles, the
Environmental Protection Agency gives data on 1160 vehicles. There
are a number of high outliers, mainly hybrid gas-electric vehicles.
If we ignore the vehicles identified as outliers, however, the
combined city and highway gas mileage of the other 1134 vehicles is
approximately Normal with mean 22.8 miles per gallon (mpg) and
standard deviation 5.3 mpg.
The quintiles of any distribution are the values with cumulative
proportions 0.20, 0.40, 0.60, and...

We expect a car's highway gas mileage to be related to its city
gas mileage (in miles per gallon, mpg). Data for all 1137 vehicles
in the government's Fuel Economy Guide give the regression
line
highway mpg = 6.785 + (1.033 * city mpg)
for predicting highway mileage from city mileage.
(a) What is the slope of this line? (Enter your answer to three
decimal places.)
mpg
Say in words what the numerical value of the slope tells us.
Highway...

In its Fuel Economy Guide for 2016 model vehicles, the
Environmental Protection Agency gives data on 1170 vehicles. There
are a number of high outliers, mainly hybrid gas-electric vehicles.
If we ignore the vehicles identified as outliers, however, the
combined city and highway gas mileage of the other 1146 vehicles is
approximately Normal with mean 23.0 miles per gallon and standard
deviation 4.9 mpg.
The quintiles of any distribution are the values with cumulative
proportions 0.20, 0.40, 0.60, and 0.80....

Assume that gas mileage for cars is normally distributed with a
mean of 23.5 miles per gallon and a standard deviation of 10 miles
per gallon. Show all work. Just the answer, without supporting
work, will receive no credit.
(a) What is the probability that a randomly selected car gets
between 15 and 30 miles per gallon? (Round the answer to 4 decimal
places)
(b) Find the 75th percentile of the gas mileage distribution.
(Round the answer to 2 decimal...

We expect a car's highway gas mileage to be related to its city
gas mileage (in miles per gallon, mpg). Data for all 1137 vehicles
in the government's 2013 Fuel Economy Guide give the
regression line
highway mpg = 6.785 + (1.033 × city mpg)
for predicting highway mileage from city mileage.
(a) What is the slope of this line? (Enter your answer to three
decimal places.)
____mpg
Say in words what the numerical value of the slope tells us....

the Environmental Protection Agency measures a mean gas mileage
for recently tested cars as 24.8 mpg with a standard deviation of
6.2 mpg. The dataset on Fuel economy in StatCrunch gives an average
of 24.2 mpg with a standard deviation of 6.5 mpg. Joe’s car is
estimated at 30 mpg.
(a) Calculate the z-scores to find the relative tab
at both sources (the Exercise and the Dataset).
(b) Relative to the other cars, with which source
will Joe have the...

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