\div 110 = 0.7955 \Rightarrow 79.55\%
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- Compute the average monthly rainfall and determine if it decreased by at least 15% from September.
- Average = \(\frac{110 + 95 + 78 + 68}{4} = \frac{351}{4} = 87.75\) mm
- Decrease from September:
- 79.55% ≥ 15% → decrease is significant.
- Answer:** Average = \(\boxed{87.75}\) mm, Yes (decrease ≈ 79.55%)
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