The following table summarizes sales by day of the week at a convenience store operated by a major domestic gasoline retailer. The data cover about one year, with 52 values for each day of the week.

(a) Which consecutive two-day period produces the highest total level of sales during the year?
(b) Do the distributions of the sales data grouped by day (as summarized here) overlap, or are the seven groups relatively distinct?
(c) These data summarize sales over 52 × 7 = 364 consecutive days. With that in mind, what important aspect of these data is hidden by this table?

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Mon Tue Wed Thur Fri Sat Sun Mean ($) Std.Dev. ($) 2,824.00 2,768.85 3,181.32 3,086.00 3,100.82 4,199.33 3,807.27 575.587 314.924 494.785 712.135 415.291 632.983 865.858