Here are the numbers of calls received during 20 randomly chosen, 15-minute time intervals at a customer support service

1,4,6,7,8,9,11,11,12,12,13,13,14,14,16,17,18,19,21,24

(a) For these data, which measures of central tendency take more than one value? Choose all that apply.

Mean

Median

Mode

None of these measures

(b) Suppose that the measurement 24 (the largest measurement in the data set) were replaced by 47. Which measures of central tendency would be affected by the change? Choose all that apply.

Mean

Median

Mode

None of these measures

(c) Suppose that, starting with the original data set, the smallest measurement were removed. Which measures of central tendency would be changed from those of the original data set? Choose all that apply.

Mean

Median

Mode

None of these measures