(99.7% of people have an IQ between 55 and 145)įor quicker and easier calculations, input the mean and standard deviation into this empirical rule calculator, and watch as it does the rest for you. A z score of zero means that your x value is equal to the mean. The standard normal distribution table is a compilation of areas from the standard normal distribution, more commonly known as a bell curve, which provides the area of the region located under the bell curve and to the left of a given z- score to represent probabilities of occurrence in a given population. (95% of people have an IQ between 70 and 130) (68% of people have an IQ between 85 and 115) Standard deviation: σ = 15 \sigma = 15 σ = 15 Let's have a look at the maths behind the 68 95 99 rule calculator: Intelligence quotient (IQ) scores are normally distributed with the mean of 100 and the standard deviation equal to 15. Quick Start Help Issues and Contributions Programming Conventions.
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