On modern IQ tests, the average score is set at what?
Answer100
Scores are scaled so that the average person in the reference group scores 100.
Science · Facts & stats
IQ facts & stats
7 fact-checked facts about IQ, intelligence tests and logic puzzles, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
All bloops are razzies and all razzies are lazzies. Must all bloops be lazzies?
AnswerYes
If every bloop is a razzie and every razzie is a lazzie, every bloop must be a lazzie.
Going deeper
On most modern IQ tests, how many points is one standard deviation?
Answer15
Tests such as the Wechsler scales are designed so one standard deviation equals 15 points.
Raven's Progressive Matrices test reasoning mainly using what?
AnswerVisual patterns, without words
Test takers pick the missing piece that completes a pattern, reducing reliance on language.
A bat and a ball cost $1.10 together. The bat costs $1.00 more than the ball. How much is the ball?
Answer5 cents
If the ball is 5 cents, the bat is $1.05, and together they make $1.10.
Expert level
What is the 'Flynn effect'?
AnswerThe rise in average IQ test scores across generations
Researcher James Flynn documented large gains in raw IQ scores in many countries through the 20th century.
In a normal distribution, about what share of values fall within one standard deviation of the average?
AnswerAbout 68%
The 68-95-99.7 rule gives the shares within one, two and three standard deviations of the mean.
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