The gas mileage of a Sam’s car is mean m 1 = 25 miles per gallon (MPG) with a standard deviation of 4 MPG. The gas mileage of Shana’s car is mean m 2 = 36 MPG with a standard deviation of 3 MPG. What is the expected difference in mean m 2-1 and standard deviation between Shana’s car and Sam’s car? A. Mean difference of 11 MPG with a standard deviation of 25 MPG.
B. Mean difference of 11 MPG with a standard deviation of 5 MPG.
C. Mean difference of 9 MPG with a standard deviation of 1 MPG.
D. Mean difference of 9 MPG with a standard deviation of 7 MPG.