To investigate the number of defects X on the screen of mobile phones, the following 100 observations on X are recorded: Number of Defects 1 2 3 4 5 Observed Frequency 27 20 15 13 14 11 Theoretically, we may postulate that the probability distribution/mass function (PDF/PMF) of the number of defects is f(IP) = (r+ 1)p(1 -p)], for r = 0, 1, 2, . . . 0, otherwise where 0