IQtests are designed to be approximately normally distributed, which results in a "bell curve" graph of IQ score frequency.
Tests are designed so that the distribution of IQ scores is Gaussian, that is to say that it follows a bell curve.
Tests also differ in their g-loading, which is the degree to which the test score reflects general mental ability rather than a specific skill or "group factor" such as verbal ability, spatial visualization, or mathematical reasoning).
IQ, an abbreviation for "intelligence quotient", is a score derived from a set of standardized tests that were developed with the purpose of measuring a person's cognitive abilities ("intelligence") in relation to their age group.
Tests are designed so that the distribution of IQ scores is more-or-less Gaussian, that is to say that it follows a bell curve.
Although such tests have become wildly popular with the explosion of the Internet in recent years, there is great reason to believe that these IQtests are highly inaccurate in their estimation of one's IQ.