Very confused with this problem, Please Help!

You are to conduct an extensive sensitivity analysis on the problem described below. The sensitivity approach will consist of two parts (a) A range approach where the most optimistic, most likely, and most pessimistic values of the dependent variables N PV and IRR are determined. (b) A range approach where the mean value is determined for each independent variable and then each variable is allowed to vary 20% about that mean while all other independent variables are held constant. Create spider plots for NPV and IRR usingg the recsults, The project life is 7 years and the MARR is 15%. The initial investment is given by a uniform distribution between $200,000 and $300,000 The annual profit is given by a triangular distribution that has a minimum value of vear, a mode of 367 ear, and a maximum valuc o car The salvage valuc of the investment is given by a triangular distribution that has a minimum value of $60,000, a mode of 75,000, and a maximum value of $85,000