In the spring of 2003, SARS (Severe Acute Respiratory Syndrome) spread rapidly in several Asian countries and Canada. The table below gives the total number, P, of SARS cases reported in Hong Kong by day t, where t = 0 is March 17, 2003. P P +. P P 0 95 26 1108 54 1674 75 1739 5 222 33 1358 61 1710 81 1750 12 470 40 1527 68 1724 87 1755 19 800 47 1621 (a) Find the average rate of change P for the intervals 19