Driving styles differ, so there is variability in the fuel efficiency of the same model automobile when driven by different people. For a certain car model, the mean fuel efficiency is 23.6 miles per gallon with a standard deviation of 2.5 miles per gallon. Select a simple random sample of 25 owners of this model and calculate the sample mean fuel efficiency bar{x}. Interpret the standard deviation from the previous part.
a) bar{x} = 23.6 mpg, The standard deviation measures the average deviation of each owner's fuel efficiency from the mean of 23.6 mpg.
b) bar{x} = 23.6 mpg, The standard deviation measures the variability in fuel efficiency within the sample of 25 owners.
c) bar{x} = 26.2 mpg, The standard deviation measures the average deviation of each owner's fuel efficiency from the mean of 23.6 mpg.
d) bar{x} = 26.2 mpg, The standard deviation measures the variability in fuel efficiency within the sample of 25 owners.