Today I went for a run with my friend Jess. We ran side by side and both used RunKeeper on our iPhones (both with Verizon service). At the end of our run, I ended up with 5.03 miles and she ended up with 5.22 miles. A friend asked if I’d used anything else to map it out, so I tried MapMyRun, which gave me 5.06 miles (using the out-and-back route setting). The Math Problem: Using the stats of your choice (explain why you chose them): 1) What is the absolute error? 2) What is the percent error? 3) Explain how we could get such different results. 1/30.