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If the boy's chronological age and mental age are equal, his IQ would be assumed to be 100. (Using chronological age x IQ/100 as the template).
If 10 out of 26 are girls, then the probability of randomly choosing a boy is 16 out of 26, or 8 out of 13, or about 0.6154.
Silly as it may sound, the average age of a 10 year old is ten years
The ratio of girls to boys in this case would be 10:1
The answer would be 1