Problem 3-7 Freight car loadings over an 18-week pertod at a busy port are as follows: Week Number W

Problem 3-7 Freight car loadings over an 18-week pertod at a busy port are as follows: Week Number Week Number 540 550 570 580 Number 410 420 430 420 430 Week 460 13 1 480 500 490 14 2 15 16 17 3 4 510 590 530 6 440 12 18 600 a. Determine a linear trend line for expected freight car loadings. (Round your Intermediate calculations and final answers to 2 decimal places.) b. Use the above trend equation to predict expected loadings for Weeks 20 & 21 (Round your final answers to 2 decimal places.) The forecasted demand for Week 20 is and for Week 21 Is C. The manager Intends to Install new equlpment when the volume exceeds 990 loadings per week. Assuming the current trend continues earliest) should the loading volume reach that evel? (Use the rounded answers, as required, from any previous part of thiS problem. Do not round any other Intermediate calculations. Round your final answer to 2 decimal places.) which week fa: the it should reach 990 ioadings Iin Week 788901