Answer:To find the mean of these ranges, we need to make a few assumptions: 1. Representing the Ranges: We'll assume each range is represented by its midpoint. - 100-110 = 105- 111-120 = 115- 121-130 = 125- ... and so on.2. Equal Weighting: We'll assume each range has equal weight in calculating the mean. Calculation: 1. Sum the midpoints: 105 + 115 + 125 + 135 + 145 + 155 + 165 + 175 + 185 + 195 = 15952. Divide the sum by the number of ranges: 1595 / 10 = 159.5 Therefore, the mean of these ranges, assuming the midpoints and equal weighting, is 159.5