Can someone please help me with this ?

Section H: Homework 1) On a test, assume u = 75 and o = 5 a) If a person's raw score is 68, find his z-score. b) If a person's raw score is 92, find his z-score. c) If a person's z-score is 2.2, find their test score d) If a person's z-score is -1.8, find their test score. 2) On a history test Patrick received a grade of 43 out of 50. The class mean was 35 with a standard deviation of 6. His girlfriend Kristin, in another section, received a grade of 87 out of 100. Her class mear was 75 with a standard deviation of 10. Who received the higher grade relative to their respective classes? Explain your answer. 3) A representative from an auto company stated that the mean weight of the cars his company produ is 3900 pounds with a standard deviation of 200 pounds. He went on to say that the lightest car had a score of -2.3 while the heaviest one had a z-score of 3.1. Find the weight of the lightest car and the heaviest car produced by the company