In a particularyear, a total of N equals 802495 college-bound seniors took the same aptitude test. Assume that the test scores are sorted from lowest to highest and that the sorted data set is {d 1, d2,..., d 802495}

(a) Determine the position of the median M.

(b) Determine the position of the first quartile Q 1

(c) Determine the position of the15th percentile X 15