To solve this problem, we will first convert the mixed numbers to improper fractions and then perform the calculations.

2 1/3 = 7/3
2 2/15 = 32/15

2 1/7 (7/3 + 32/15) - 8.8
= 15/7 (105/45 + 96/45) - 8.8
= 15/7 (201/45) - 8.8
= (15 201) / (7 * 45) - 8.8
= 3015/315 - 8.8
= 67/7 - 8.8
= (67 - 61.2) / 7
= 5.8 / 7
= 0.8286 (rounded to four decimal places)