just #5

5. [10] The lifetimes of light bulbs are Normally distributed with standard deviation of 15 hours and the mean of 580 hours. Find the probability of a bulb lasting for at most 600 hours. Round your answer to four decimal places. 6. [10] The mean cost of a five-pound bag of shrimp is $50 with a standard deviation of $3. If a sample of 45 bags of shrimp is randomly selected. what is the probability that the sample mean would differ from the true