Find the probability of a pulse rate between 60 beats per minute and 70 beats per minute. Female Pulse Rates. In Exercises 13–20, assume that an adult female is randomly selected. Females have pulse rates that are normally distributed with a mean of 74.0 beats per minute and a standard deviation of 12.5 beats per minute (based on Data Set 1 “Body Data” in Appendix B). (Hint: Draw a graph in each case.)