For the following questions show the detailed calculations, most marks will be a

For the following questions show the detailed calculations, most marks will be a

For the following questions show the detailed calculations, most marks will be allocated for correct calculations.
Q1. The lifetime of a mechanical aortic valve is normally distributed with a mean life of 30 years and a standard deviation of 1.2 years. Find the chances that a randomly selected patient who had an aortic valve replacement will not be required to replace his/her (replaced) valve again in the next 32 years.
Q2. Given that the scores on a medical test follow a normal distribution with a mean of 460 and a standard deviation of 100. If all students in a class of 41 attend the test what is the probability that the given class will obtain a mean score of above 590?