".. in an IQ TEST Harry only scored four whilst william scored seven , that does indicate he is not the brightest."

Intelligence Quotient tests normally have scores ranging either side of 100. Two thirds of the population score between 85 and 115, giving a Median score of 100.

About 2.5% of the population scores above 130 and 2.5 % below 85.

To score just 4 would indicate a very serious condition.