Approximately two-thirds (68 percent) of all scores on the wais fall between and a range that is considered to indicate normal or average intelligence.

The correct answer is:

85, 115

Explanation:

known as Wechsler Adult Intelligence Scale or WAIS, the metric created by psychologist David Wechsler is used to determine the levels of intelligence of a human being according to a group of capacities considered to conform what is known as human intelligence. The WAIS test has had an evolution throughout history through 4 versions, the first one published in 1955, to the present; and now being one of the most employed tests for intelligence metrics. As mentioned, the most recent test adopted by science was published in 2008 with its improvements, WAIS-IV takes into account aspects such as verbal comprehension, perceptual reasoning, working memory and processing speed to determine the level of intelligence of an individual.