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2. If X is a continuous random variable with PDF f(x) and CDF F(x). The (100p) percentile is a number, denoted by 7p, such that the area under f(x) and to the left of a is p. That is, P = / f(x)dx = F(Xp). -DO Usually, we call 70.25 as the Ist quartile (91), To.50 as the median (m) or 2nd quartile (q2), and 70.75 as the 3rd quartile (93). If we have f(x) = 1/2 for 0