Find the mean (add all the numbers and divide the total by the number of data points) for the following set of numbers: -6, -4.5, 6, 9, 10.5 (right answer gets brainliest)

Renee hiked for 6 3/4 miles. after resting, renee hiked back along the same route for 5 1/4 miles. how many more miles does renee need to hike to return to the place where she started? represent your answer as a simplified mixed number, if necessary.