I need help solving this equation?

A fitness company is building a 20-story high-rise. Architects building the high-rise know that women working for the company have weights that are normally distributed with a mean of 143 lb and a standard deviation of 29 lb, and men working for the company have weights that are normally distributed with a mean of 184 lb and a standard deviation or 23 lb. You need to design an elevator that will safely carry 13 people. Assuming a worst case scenario of 13 male passengers, find the maximum total allowable weight if we want a 0.975 probability that this maximum will not be exceeded when 13 males are randomly selected. maximum weight = Slb Round to the nearest pound