The mass of a species of mouse commonly found in houses is normally distributed with a mean of 19.9 grams with a standard deviation of 0.15 grams. a) What is the probability that a randomly chosen mouse has a mass of less than 19.73 grams? b) What is the probability that a randomly chosen mouse has a mass of more than 20 grams? c) What proportion of mice have a mass between 19.8 and 19.97 grams? Submit Question