Homework cost part B The rooms department's daily utility cost of a hotel is recorded as below: Y (Room Dept. Daily Utility X (Daily Rooms cost $) sold 37 70 370 58 389 73 412 77 388 74 373 69 368 68 421 75 354 69 416 81 37 72 370 67 389 71 412 76 388 72 373 68 368 68 421 77 354 67 416 80 Requirements: a. Use Excel regression to find a model for estimating fixed and variable utility costs. b. What are the fixed and variable utility costs of the rooms department? c. If 86 rooms are to be sold, what is expected total utility cost