20 21 22 23 24 Fa) 11 10 14 7 1 Let * be the ages of students in a class. Given the frequency distribution F(x) above, determine the following probabilities: (a) P(20 21) =A certain typing agency employs two typists. The average number of errors per article is 2.4 when typed by the first typist and 4.7 when typed by the second. If your article is equally likely to be typed by either typist, find the probability that it will have no errors. C]