What is The upper boundaries for a distribution of waiting times (in seconds) in a grocery store aisle are 48 60 72 and 84. List the value for each lower boundary in this distribution.?

The lower boundaries for the distribution of waiting times corresponding to the upper boundaries of 48, 60, 72, and 84 seconds are determined by finding the value just below each upper boundary. Therefore, the lower boundaries are 0 (for 48), 48 (for 60), 60 (for 72), and 72 (for 84). So, the lower boundaries are 0, 48, 60, and 72 seconds.