Here are the numbers of calls received at a customer support service during 7 randomly chosen, hour-long intervals. 20, 14, 14, 14, 18, 18, 18 Send data to calculator (a) What is the median of this data set? If your answer is not an integer, round your answer to one decimal place. (b) What is the mean of this data set? If your answer is not an 16.5 integer, round your answer to one decimal place. (c) How many modes does the data set have, and what are zero modes their values? Indicate the number of modes by clicking in the O one mode: appropriate circle, and then indicate the value(s) of the mode(s), if applicable. O two modes: 14 and 18