4. In a small pharmacy, suppose there is an average of 2 prescriptions of a certain drug per week. Use Poisson tables to answer the following. 0 1 2 3 4 5 6 7 8 (x) .1353 .2707 .2707 .1804 .0902 .0361 .0120 .0034 .0009 (XX) .1353 .4060 .6767 .8571 .9473 .9834 .9954 .9989 9998 a. Find the probability that there are exactly 1 prescriptions for this drug in a given week. b. Find the probability that there are no more than 4 prescriptions for this drug in a given week. c. Find the probability that there is at least 1 prescription for this drug in a given week. d. Suppose we observe 7 prescriptions for this drug in a given week. Would you consider this an unusually high number? Calculate a probability to justify your