As you can see, the score that is exactly the average will convert to zero standard deviation units, the score that is one standard deviation below the average will convert to -1 standard deviation units, and so on. Once each score is expressed in standard deviation units, we can then convert it to any scale we desire. The scale used in the WOAP is the experience score scale. So, once we have the eval scores in terms of their standard deviation, we convert them to the desired scale by multiplying the standard deviation units by the standard deviation of the desired scale and then adding the average of the desired scale - working the formula above backwards, in other words. As you recall, we need the standard deviation of the eval scale to be 1.5 times as big as the experience standard deviation.
Every specialty is different, with different eval stats and experience stats.
Watch out for callers who say their buddy's raw eval average converted to a different value that their same raw average did. They'll be in different specialties. Some callers will want to know why their '98 scores very similar to their '97 score convert to different values. Every year is different. That is, the MAT average eval and average experience will vary from year to year, as the candidate pool changes from year to year.