I'm unsure how to solve this, any help is appreciated! Please explain solution. Only need Part A.

Problem 2 (10 pts) (a) (5 pts) Imagine measuring the length of a stick. Suppose we obtain a set of measurements: {X1, X2, ..., In}. We report our value as Tom (at the 68%-confidence level), where x = _ _ xi and om is defined in "Free to use without ...". What is the meaning of this interval? (b) (5 pts) To find the velocity of a cart on a horizontal air track, a student measures the distance d it travels and the time taken t as d = 5.10 + 0.01m and t = 6.02 + 0.02s. Report your result for v = d/t