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 IQ of everyone is 100. See the related links for a site that has some basic facts about IQ, for more information.
The average is going to range from 90 to 110. That covers half the population.