You have a restaurant with 45 tables divided into five sections of equal size. You are only open starting at 17:00 Tuesday to Sunday, closing each day at 22:00, with last seating at 21:00.

Your track record is the following: Tuesday - 11 at 17:00, 23 at 18:00, 23 at 19:00, 19 at 20:00 and 8 at 21:00 Wednesday - 9 at 17:00, 31 at 18:00, 34 at 19:00, 27 a t 20:00, 15 at 21:00 Thursday - 13 at 17:00, 31 at 18:00, 40 at 19:00, 35 at 20:00, 20 at 21:00 Friday - 21 at 17:00, 42 at 18:00, 44 at 19:00, 35 at 20:00, 27 at 21:00 Saturday - 18 at 17:00, 40 at 18:00, 45 at 19:00, 41 at 20:00, 37 at 21:00 Sunday - 12 at 17:00, 25 at 18:00, 32 at 19:00, 30 at 20:00, 8 at 21:00.

You have five wait staff, each of which is equally well trained. By law once brought in for a shift you must pay them for 4 hours whether they work or not.

How many people are needed each hour each day, looking to serve the market effectively and minimising your labour costs?