Question 5.47

17. Refer to the data and the stemplot in Exercise 13.

  1. Find the mean of the 18 values in Exercise 13.
  2. Your stemplot of the scores suggests that the score 200 is an outlier. Find the mean for the 17 observations that remain when you drop the outlier. [Hint: Can you use the work you did in part (a) to avoid calculating this new mean from scratch?]
  3. How does the outlier change the mean?

17.

(a)

(b) Without the outlier, .

(c) The high outlier pulls the mean up.