GadRev is a firm that reviews different latest gadgets through a team of four reviewers (R1, R2, R3, and R4). Recently the reviewers reviewed four different tech gadgets (A, B, C, and D) on a scale of 1 to 5 (all integer values) where 1 denotes poor and 5 denotes excellent. These review ratings were then tabulated. However, due to a technical glitch, some of these ratings got deleted. The average rating given by each reviewer, and the average rating given to each gadget were earlier communicated to the team management in a separate email and hence can be useful to retrieve the deleted ratings. The available ratings along with the average ratings are represented in the following table (blank = deleted): Reviewer | A | B | C | D | Average R1 | - | 4 | - | 3 | 4 R2 | 3 | - | 4 | - | 4 R3 | - | - | - | 5 | 4 R4 | - | 4 | 5 | - | 4.25 Average | 4 | 4 | 4 | 4.25 |