Need help with practice questions. Those are practice questions. Please help me so I may better understand.

14. The following data describe where a set of 236 students sit in a classroom and their final grades. Round all answers to three decimals. Front Row Middle Row Back Row Total A 20 38 7 65 B 26 88 34 148 C 6 11 6 23 Total 52 137 47 236 a. What is the probability that a student has an A or sits in the front row? b. What is the probability that a student has a B, given they sit in the middle row? to algnine mobno A fi C . What is the probability that if two students are selected without replacement that they both sit in the middle row? 15. Males and females were asked about what they would do if they received a $100 bill by mail, addressed to their neighbor, but wrongly delivered to them. Would they return it to their neighbor? Of the 69 males sampled, 52 said yes and of the 131 females sampled, 120 said yes. At the 5% significance level do the data provide sufficient evidence to conclude that the proportion of men that would return the money is different than women that would return the money? (Perform an appropriate hypothesis test showing all steps.)