1. The problem asks us to find between which two consecutive days the amount of data decreased the most. 2. We are given the data usage for 6 days: Day 1 = 2.8, Day 2 = 2.4, Day 3 = 2.2, Day 4 = 2.0, Day 5 = 1.7, Day 6 = 1.5. 3. To find the largest decrease, calculate the difference between each pair of consecutive days: - Between Day 1 and Day 2: $2.8 - 2.4 = 0.4$ - Between Day 2 and Day 3: $2.4 - 2.2 = 0.2$ - Between Day 3 and Day 4: $2.2 - 2.0 = 0.2$ - Between Day 4 and Day 5: $2.0 - 1.7 = 0.3$ - Between Day 5 and Day 6: $1.7 - 1.5 = 0.2$ 4. Compare these decreases: $0.4, 0.2, 0.2, 0.3, 0.2$. 5. The largest decrease is $0.4$ between Day 1 and Day 2. 6. Therefore, the amount of data decreased the most between Day 1 and Day 2.