please break this down so I can understand the formulas to get the answers so I can solve part b. thanks!

Homework: Topic 4 Homework Save 39 of 40 (39 complete) HW Score: 87.5%, 35 of 40 pts Score: 0 of 1 pt x 7.4.7-T Question Help Here is a sample of amounts of weight change (kg) of college students in the freshman year: 10.7.-1.-7where - 7 represents a loss of 7 kg and positive values represent weight gained. Here are ten bootstrap samples. [10, 10, 10.-1). [10, -7,-1,10). 10.-7.7. - 11. 7.-7. - 1. 10),(-1,-1,-1,7). {7.-7.7.-7). [10,7. -7, -1).-7. 7.-7. 77.-7, -1, -7.71.7. 10, 10, 10). Completo parts (a) and (b) below a. Using only the len given bootstrap samples, construct an 80% confidence interval estimate of the mean weight change for the population