International Dairy Queen, Inc., a firm whose business is highly seasonal, has reported the following quarterly net income figures for 1991 through 1995.

a. Construct the four-quarter centered moving average for these data and determine the percentages of the moving average for the quarters.
b. Determine the seasonal indexes for the quarters. 

c. Use the seasonal indexes to deseasonalize the original time series.

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Net Income (Millions) II IV 1991 $4.374 8.227 10.185 5.135 1992 4.406 8.674 10.536 5.479 4.548 1993 8.727 10.677 5.936 4.614 9.260 1994 11.164 6.383 1995 4.910 9.848 11.747 6.712