Excel - Normal Distribution NORM.D|ST(x, mean, std dev, true) returns the value of ax x) for the normal curve with the given mean and standard deviation). The weight of male students at a certain university is normally distributed with a mean of 175 pounds with a standard deviation of 7.6 pounds. Find the probabilities. 1. A male student weighs at most 186 pounds. 2. A male students weighs at least 160 pounds. 1 -NORM .DlST(160,175,7.6,truel= 3. A male student weighs between 165 and 180 pounds