It has no unit; it is just a number, which is based on a normal distribution with mean 100 and standard deviation 15. The "average" person has an IQ of 100.
There is a standard error associated with calculating IQs of a 95% chance that the actual IQ is within the range of the given IQ ± 4; which means that someone with an IQ of 102 could actually have less of whatever it is the IQ tests measure than someone with an IQ of 100.
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the level of measurement is interval
No, a pencil is not a unit of measurement.
The smaller the unit the more accurate the measurement will be.
divide
By unit of length and distance and conversion ,we can say that meter is a a standard unit of measurement