A single data point is not enough. The average GPA of admitted students is 3.85, so yes, there are many students at UMi with GPAs of 3.7. But: your course rigor, test scores, your EC’s, any ‘hooks’, etc. will also matter. A lot.
As for EC’s: it’s not how many, but how strong your ECs are. Depth, achievement, leadership, etc. matter more than just racking up lots of activities.