Halo Save & Submit Check my work Problem 18-13 points Trucks arrive at the loading dock of a wholesale grocer at the rate of 12 per hout A single crew consisting of two workers can loada truck in about 30 minutes Crew members receive $10 per hour in wages and fringe benefits, and trucks and drivers reflect an hourly cost of $69. The manager is thinking of adding another member to the crew. The service rate would then be 2.4 trucks per hout Assume rates are Poisson Use Table and Table2 a. Would the third crew member be economical? (Round your intermediate and final answer to 2 decimal places. Omit the "S" sign in your response.) Yes because, the total cost is $ b. Would a fourth member be justifiable if the resulting service capacity were 3 trucks per hour? (Round your intermediate and final answer to 2 decimal places. Omit the "S" sign in your response.) Yes because the total cost is $ UNE