I need help!

How much do you study? A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 27 and standard deviation 10. Use the @ Cumulative Normal Distribution Table to answer the following. (a) What proportion of students studied more than 43 hours? (b) What is the probability that a randomly selected student spent between 19 and 33 hours studying? (c) What proportion of students studied less than 34 hours? Part 1 of 3 The proportion of students who studied more than 43 hours is Part 2 of 3 The probability that a randomly selected student studied between 19 and 33 hours is Part 3 of 3 The proportion of students who studied less than 34 hours is