CHILD DEVELOPMENT PEDAGOGY

Detailed explanation-1: -The two-standard-deviations rule implies that about 5 percent of the population have IQ scores more than 30 points away from 100: 2.5 percent above 130 and 2.5 percent below 70.

Detailed explanation-2: -On many tests, a score of 100 is considered the average IQ. Sixty-eight percent of scores fall within one standard deviation of the mean (that is, between 85 and 115). That means that nearly 70% of all people score within plus or minus 15 points of the average score.

Detailed explanation-3: -About 95% of individuals have IQ scores in the interval 100 ± 2 ( 15 ) = [ 70, 130 ] .

Detailed explanation-4: -IQ tests are made to have an average score of 100. Psychologists revise the test every few years in order to maintain 100 as the average. Most people (about 68 percent) have an IQ between 85 and 115. Only a small fraction of people have a very low IQ (below 70) or a very high IQ (above 130).

Detailed explanation-5: -Approximately 95% of the population has IQ scores between 70 and 130. Approximately 99.7% of the population has IQ scores between 55 and 145. Only approximately 0.3% of the population has IQ scores outside of this interval (less than 55 or higher than 145).