Use the table of random digits given at the end of this book to obtain a sample of 15 independent observations in which 13 of the 15 are drawn from the uniform distribution on the interval (-1.1) and the other two are drawn from the uniform distribution on the interval (- 10, 10). For the 15 values that are obtained, calculate the values of
(a) the sample mean;
(b) the trimmed means for k = 1, 2, 3, and 4; and
(c) the sample median. Which of these estimators is closest to O?