Mean Weight of Male Medical Students Data Set 1 “Body Data” in Appendix B includes weights of 153 randomly selected adult males, and those weights have a standard deviation of 17.65 kg. Because it is reasonable to assume that weights of male medical students have less variation than weights of the population of adult males, we can be conservative by letting s = 17.65 kg. How many male medical students must be weighed in order to estimate the mean weight of all male medical students? Assume that we want 90% confidence that the sample mean is within 1.5 kg of the population mean. Does it seem reasonable to assume that weights of male medical students have less variation than weights of the population of adult males?