can you please help me with this question

3. (20 points) A recent study claims that the starting salaries for a college graduate in the actuarial field are normally distributed with mean $65, 000 and a standard deviation of $7, 000. (a) Determine the probability that an individual graduate will have a salary of over $67, 000. (b) Suppose a group of 50 graduates are selected at random. Determine the probability that the sample mean is greater than $67,000