Okay so I calculated my mean how ever I am confused how do we calculate the median in this certain question like what formula do we use? I've been using P50 = n+1 divide 100 x 50 but for this question someone else said u can't use it in this scenario?

10. A recent review of a compact disc distributor's product line is summarized as follows: 0 to under 5 5 to under 10 174 10 to under 15 231 15 to under 20 1568 20 to under 25 1328 25 to under 30 242 30 to under 35 93 35 to under 40 11 Calculate the following (be sure to show your work): [3] a) mean [4] b) median [2] c) range [5] d) interquartile range [4] e) standard deviation