What is a good IQ score

First off, the IQ score is based on the mean using a guassian distribution. This means that the average IQ score is "curved" to a score of 100. Consequently, this means that 50% of the people score above a score of 100, and 50% of people score below 100. A histogram of IQ scores looks like this:


Lastly, here are the descriptions of IQ scores:
If you have above 144, then you are assigned into the Genius category
If you have between 130 and 144, then you are in the gifted category
Between 100 and 130, you are in the above average category
Anything below 100 is below average.