An inspector at a shirt factory randomly selects shirts to inspect for defects. The table below shows the number of shirts she found with defects last week. On Monday 50 shirts were inspected and 6 were defective, on Tuesday 35 shirts were inspected and 4 were defective, on Wednesday 40 shirts were inspected and 4 shirts were defective, on Thursday 30 shirts were inspected and 3 shirts were defective, on Friday, 45 shirts were inspected and 5 shirts were defective. Based on this information, which of these is the best estimate of the probability that the next shirt she inspects will have a defect?