The table shows how the radioactivity in iodine-131 decreases over time. The initial amount is 2.00 grams. Radioactivity in Iodine-131 Day 1 2 3 45 7 8 Grams 1.83 1.68 1.54 1.41 1.30 1.19 1.09 1.00 6 Calculate the average rate of change in grams per day from day 4 to day 7. Enter your answer as a decimal rounded to the tenths place.