The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 255.2 and a standard deviation of 68.6. (All units are 1000 cells/ L.) Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage of women with platelet counts within 2 standard deviations of the mean, or between 118.0 and 392.4 ? b. What is the approximate percentage of women with platelet counts between 186.6 and 323.8 ? For a data set of the pulse rates for a sample of adult females, the lowest pulse rate is 39 beats per minute, the mean of the listed pulse rates is x=79.0 beats per minute, and their standard deviation is s=12.3 beats per minute. a. What is the difference between the pulse rate of 39 beats per minute and the mean pulse rate of the females? b. How many standard deviations is that [the difference found in part (a)]? c. Convert the pulse rate of 39 beats per minutes to a z score. d. If we consider pulse rates that convert to z scores between 2 and 2 to be neither significantly low nor significantly high, is the pulse rate of 39 beats per minute significant