Freight car loadings over an 18-week period at a busy port are as follows: Week Number Week Number W 1 answer below »

Freight car loadings over an 18-week period at a busy port are as follows:
    
Week
Number
Week
Number
Week
Number
1
300
7
365
13
485
2
305
8
395
14
490
3
310
9
425
15
540
4
305
10
420
16
545
5
310
11
450
17
550
6
315
12
480
18
555
a.
Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.)
y = + t
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 .
The manager intends to install new equipment when the volume exceeds 880 loadings per week. Assuming the current trend continues, in which week (at the earliest) should the loading volume reach that level?
(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.)
  It should reach 880 loadings in Week ??