Question

(3.37) NOTE: The numerical values in this problem have been modified for testing purposes 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 5.2 mpg. 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 (0.01) of the distribution of gas mileage? The first quartile is The third quartile is mpg. mpg eBook (3.28) Find the proportion of observations (0.0001) from a standard Normal distribution that falls in each of the following regions. In each case, sketch a standard Normal curve and shade the area representing the region (a)z -2.2: (e)z>1.77: (d) 2.2<주< 1.77;

Answer 1