8.17. Pizza Delight has randomly selected six weekdays during the past month and recorded orders for pizza at four different time periods per day as follows.

a. Calculate the seasonal index for each of the time periods.

b. If the forecast demand for the seventh day is 262 units, find the forecast for each of the time periods.

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Time Period Days 3 4 5 9 10.00 A.M.-3.00 P.M. 65 62 55 60 66 56 50 3.00 P.M.-7.00 P.M. 72 56 58 64 58 68 7.00 P.M.-11.00 P.M. 44 38 45 56 57 60 11.00 P.M.-2.00 P.M. 36 43 48 54 50 32