It is average. Scores range from 120 (low) to 180 (high). A 151 is usually considered the median score, 163 is very good, and 178 or higher is excellent. Top schools demand scores in the 160s or above.
A score of 148 on the LSAT is about average. The scores on the four scored sections are normalized to a bell curve going from a low of 120 up to 180; 151 is the 50th percentile. Think you can beat 148? You can take it again.
The LSAT scoring range is 120-180, with an average score of 150. A score of 148 is slightly below average, and most law schools will not accept a candidate with such a score.