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From what I remember learning at school...

IQ follows the natural curve. That means given the average score and the standard deviation we can begin to define what a good score is.

The average for IQ tests, by design is 100.

So, right off the bat we see that every score is above average, and therefore they are all good scores, relative to the mean.

It doesn't matter what age you are, your score can be compared to anyone's.

We also know the standard deviation for IQ scores is 15, so we can begin to quantify how good the scores are if we know how standard deviation works.

We know that 50% of the people will score below 100.

If we move one standard deviation better than the mean we get 115. That's better than 84% of people.

90% of people will score under 130 (two standard deviations better than average).

99.4% of people will score under 145 (three standard deviations).

99.99% score under 160 (four s.d)

99.99997% score under 175 (five s.d.) (about 1 in 3 million score higher)

99.9999999% score under 190 (six s.d) (about 1 in 1 billion score higher)

Finally, 99.9999999999% score under 205 (seven s.d.) (about 1 in 1 trillion score higher (an impossible score)).

I know the percentages because that is just how standard deviations work.

http://en.wikipedia.org/wiki/Standard_deviation

Your question is inappropriate as all IQ tests are "normed". Any score will be relative to other children or adults of the same age. These tests are intentionally tested on children of different ages to discover what a "normal" child of a given age will score. The IQ score is how the individual did in relation to that normalized score. Anything over 100 is better than that age normed score and anything below 100 is below that normalized score.

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Q: Is 145 a good IQ score for a 13 year old also is 122 a good IQ score for a 10 year old is 114 another good score for a 9 year old is 111 a good score for a 12 year old are these all good scores?
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