what should thr proportion be for each letter if they are really made at random?

Use proper notation in answering each of the following questions, (a) Find the relative frequency (proportion) of answers for each letter in Table 7.1. (b) If the letter choices are really made at random, what should be the proportion of all AP multiple choice questions that have each letter as the correct answer? Table 7.1 Choice for correct response of 400 AP multiple choice questions Answer A B c D E Frequency 85 90 79 78 68 i, = = 5 _ 90 . _ (@) Pa =755 = 0.2125 py = q00 8-225 Pe = 75, = (0.1975 $= = 0.195 Be =. = 0.170 (b) If five letter choices are random, the proportion each is correct should be 1/5 for each letter, so Pa= Po= Pc= Pa= Pe=O.2 Statistics: Unlocking the Power of Data