1. A random sample of 30 students selected from a class yielded an average weight of 260 kg with a variance of 4900. Determine the 95% confidence interval for estimating the average weight of students in future. 2. The following table gives the ranking of 8 ladies in a beauty contest by two judges. Contestant A B C D Rank by 3 4 6 E 8 F 7 Judge 1 Rank by 2 4 7 6 8 Judge 2 Do the judges agree on their ranking of the ladies? G H 2 3 015 ​