busbars can have a cross sectional area of as little as 10 square millimetres 0 016 sq in but electrical substations may use metal tubes 50 millimetres 2 0 in in diameter 20 square millimetres 0 031 sq in or more as busbars
IQ bell curve. Standardized IQ tests are designed so that the exact average (mean) IQ score in the general population is 100. An âaverage IQ scoreâ or ânormal IQ scoreâ can be defined as a score between 85 and 115. 68% of people score between 85 and 115. The Mensa qualifying IQ score is a score that puts you in the top 2% of the population in a bell curve like this one. The Mensa qualifying score is 130 or higher, as shown below.
The Stanford-Binet and Wechsler tests use the same score scale: average intelligence is between 90 and 110; genius, or gifted, is above 140; and below 70 is considered mentally deficient. The Cattell test uses a wider scoring scale, so that scores between 90 and 140 are average, and genius level IQ is over 160.he three main types of IQ tests all use a scoring scale from 0 to 200. Test scores are calculated so that the average score for each test is 100 -- so a 100 IQ score designates average intelligence.