UHSTAT4 8.E.071. MY NOTES PRACTICE AN Find the following probabilities for X = pulse rates of group of people, for which the mean is 74 and the standard deviation is 4. Assume a normal distribution. (Round all answers to four decimal places.) (a) P(X 5 73). (b) P(X 2 80). ( c) P( 66 5 X 5 84). You may need to use the appropriate table in the Appendix of Tables to answer this