I think an average GPA would be a 3.3 since that is a 'C' (or about 75%) and a C is average but Im really not sure, and the average IQ for all ages is 100(well its 98-110 that is considered regular average but 100 is the absolute average).
100
100
100
110
well it is above average for a 13 year old so yes 128 is a respectable IQ average!
100.
No
its above average, the average IQ is 100 whatever your age.
Around 100-170
it is excellent and above average
The average is going to range from 90 to 110. That covers half the population.
The average IQ of everyone is 100. See the related links for a site that has some basic facts about IQ, for more information.