The table below summarizes the number of minutes customers spend on hold when they call Comcast customer service. Minutes Relative Cumulative Cumulative Frequency Relative Frequency Frequency Frequency 18-20 8 0.178 8 0.178 21-23 12 0.267 20 0.444 24-26 19 0.422 39 0.867 27-29 4 0.089 43 0.956 30-32 2 0.044 45 1 a) How many customers were involved in the sample? 45 b) Write a sentence interpreting the frequency 2 in the table. c) Write a sentence interpreting the relative frequency 0.267 in the table. d) Write a sentence interpreting the cumulative frequency 39 in the table.