The third module to be completed is module C2, which is finished on August 23rd. It was estimated that this module would take 37.5 hours to produce, but it actually took 48 hours.
| Module | A6 | A5 | C2 | |||||
|---|---|---|---|---|---|---|---|---|
| Date Completed | 20/8 | 21/8 | 23/8 | |||||
| Actual | 33.0 | 37.5 | 48.0 | |||||
| Estimated | 37.5 | 30.0 | 37.5 | |||||
| X | -4.5 | 7.5 | ||||||
| mR | 12.0 |
What is the value of X for this module?