please i need help with this one

please don't use excel or google sheet use an actual equation

8.3.2) Determine the values of the following x2 percentiles: X.05, 12, X.025, 18, X.01, 10, X.95, 18, X.99, 8, X.995, 14, X.005, 20 8.3.5) An article in the Austraian Journal of Agricultureal Research determined that the essential amino acid (Lysines) composition level of soybean meals is as shown here (g/kg): 20.2 24.9 22.5 26.5 27.0 24.5 26.0 23.5 25.4 24.0 (a) Constrict a 98% two-sided confidence interval for o2. (b) Construct a 99% lower confidence bound on for o2. (c) Calculate a 95% lower confidence bound for o. (d) Compare the intervals that you computed in parts (a) and (b)