Please may someone show me how to solve these with the work shown please?

/4 1. The number of calories per candy bar for a random sample of standard-size candy bars is shown below. Estimate the mean number of calories per candy bar with 98% confidence. 210 220 220 220 230 230 240 240 240 260 260 275 280 280 (2) a. Find the mean for the data b. Find the sample standard deviation (1/2 mark/work, 1/2 mark/answer ) (1/2 mark/work, 1/2 mark/answer ) (2) c. Find the 98% confidence interval of the mean (1 mark/work, 1 mark/answer): /6 2. A survey of 100 Americans found that 68% said they find it hard to buy holiday gifts that convey their true feelings. Find the 90% confidence interval of the population proportion. (2) a. Find q (1/2 mark/work, 1/2 mark/answer ) b. Find "/2(/2 mark/work, 1/2 mark/answer ) (2) c. Find z a/ (1 mark ) d. Find E ()/2 mark/work, /2 mark/answer ) Stats - Lab_07 - Student's - Lj - Page 1 of 3