Here are the numbers of calls received during 21 randomly chosen, 15-minute time intervals at a customer support service.

1, 3, 6, 7, 8, 9, 11, 11, 12, 12, 13, 13, 13, 13, 14, 16, 16, 18, 19, 22, 23

Mean (a) Which measures of central tendency do Median not exist for this data set? Choose all that apply. Mode None of these measures (b) Suppose that the measurement 23 (the Mean largest measurement in the data set) were Median replaced by 45. Which measures of central tendency would be affected by the change? Mode Choose all that apply. None of these measures (c) Suppose that, starting with the original Mean data set, the smallest measurement were Median removed. Which measures of central Mode tendency would be changed from those of the original data set? Choose all that apply. ONone of these measures (d) Which of the following best describes the Negatively skewed distribution of the original data? Choose only Positively skewed one. ORoughly symmetricalFrequency 10 8- 6 4 4 4 2 2 N O U 10 15 20 25 Number of calls