Hello I am stuck on this Stats question, thank you for any help!

During the late 1800s, a certain lake in Wisconsin was sample frozen on an avg. of 124. 9 days / year . A random of & recent years provided the following data on numbers of day That the lake wow frozen over 103 80 79 135 134 77 80 1 11 a ) At the 5 % Significance Ivl , do the data provide sufficient evidence to conclude that the avg. # of ice days is less now Than in the late 1800s ? Assume the population of the # of frozen days is normally distributed. use the critical value approach a the p-value approach. 5 ) Find a 99% Confidence Interval for the avg. # of ice days in recent years