Question

You test 8 automobiles and find that their mileage ratings are 28, 28, 29, 30, 33, 34, 35, and 340 mpg, arranged in order from smallest to largest. The average of these numbers is 557 ÷ 8, or 70 mpg. However, the last data value (340 mpg) seems impossibly large, and you decide that it must be due to an error in the data gathering process. Rather than doing all your measurements all over again, at considerable expense, you decide to simply ignore the "bad" value of 340 mpg. (When they do this, scientists say they are "rejecting the outliers," by ignoring unreasonable values that are nowhere clo

Answer 1

close to the main cluster of data points. This procedure has some risks.) What is the mean of the remaining mileage numbers?