Suppose the scores on an examination are normally distributed with a mean

Suppose the scores on an examination are normally distributed with a mean of 50 and a standard deviation of 10. 1) What is the probability that the score of a student will be higher than 60? 2) what proportion of the students score below 30? 3) What is the z score that corresponds to the score 44? 4) What is the raw score that corresponds to z=1.5?