15
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To analyse data, it is best to first order the data from smallest values to largest values. In this case, that would be: 85, 93, 95, 96, 98, 99, 100, 100. The range is simply the largest number less the smallest. So in this case 100-85, which comes out at 15. Thus the range of the data set in the question is 15.
Halfway between 70 and 100 is (70 + 100) ÷ 2 = 85.
85% of 100 = 85% * 100 = 0.85 * 100 = 85
68, 85.
(70 + 100)/2 = 170/2 = 85