Having a hard time completing this practice sheet and would really appreciate if someone can help me so I can learn this!

1. Scores on a recent Statistics final exam in a large class were normally distributed with a mean of 79.5 and a standard deviation of 9.8. A. If a random student from this class was selected then what is the probability that this student a score below 83? A. B. If a sample of 20 students is drawn from this class, what is the probability that their mean score will be above 82? B. 2. Women have head circumferences that are normally distributed with a mean of 20.85 inches and a standard deviation of 0.95 inches. A. If the HATS BY CHARLIE company produced hats so that they fit head circumferences between 19.5 inches and 22.2 inches, then what is the probability that a woman can fit into these hats? A. B. If the HATS BY CHARLIE company produced hats so that they fit head circumferences between 19.5 inches and 22.2 inches, then what is the probability that a randomly selected group of 45 woman can fit into these hats