Final answer:
To determine the width of each stripe, Savannah needs to divide the total length of the wall by the number of stripes she wants.
Step-by-step explanation:
To determine the width of each stripe, Savannah needs to divide the total length of the wall by the number of stripes she wants. In this case, the wall is 15 yards long and she wants 96 stripes. So, she should use the calculation 15 yards / 96 stripes = 0.15625 yards. Therefore, each stripe should be approximately 0.15625 yards wide.