1. That’s not what batting average measures. It measures the percentage of time a batter gets a hit in a plate appearance in which he does not walk, get hit by a pitch, voluntarily give himself up by bunting to move a runner over, or hit a reasonably deep fly ball with a runner on third and less than two out.
2. 49 + .306 does not equal .355. It equals 49.306.
3. If you want XBH to be incorporated with BA, that’s exactly what SLG does…