Scores on the final in a statistics class are as follows. 75 25 86 92 75 40 52 80 85 80 99 90 60 74 72 55 87 70 85 70 Click here for the Excel Data File a. Calculate the 25th, 50th, and 75th percentiles. (Use the methodology shown in Section 3.2 of the text to calculate the percentiles. Do not round intermediate calculations. Round your answers to 2 decimal places.) 25th percentile 50th percentile 75th percentile b-1. Calculate the interquartile range. (Round your intermediate calculations at least to 4 decimal places and final answers to 2 decimal places.) Interquartile Range