Ten.
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Then it is superior and above average, it is based on mental age divided by actual age times 100. Not same scale for all ages.
Silly as it may sound, the average age of a 10 year old is ten years
IQ is traditionally the ratio of mental age to physical age multiplied by 100. At the extremes, it's largely meaningless - an IQ of 1 would mean a 100 year old person with a mental age of 1. The average IQ (Intelligence Quotient) is between 90 - 110. So for one to have an IQ of 1 would be highly improbable.
your mental age (the age group that's average score is closest to yours in an IQ test) divided by you physical age multiplied by 100
First, you take the test. It depends on how well you answered the test. By this I mean if you answered it like a 22 year-old that is your mental age. Then, you divide your mental age by your real age, next, you multiply that by 100.