95% of the data falls within two standard deviations of the mean.68% of the data falls within one standard deviation of the mean.Percentage Distribution of Data Around Mean The probability density function (pdf) for Normal Distribution: It is a continuous probability distribution. People use both words interchangeably, but it means the same thing. What is Normal Distribution?Ī Normal Distribution is also known as a Gaussian distribution or famously Bell Curve. But if we have the distribution of heights of adults in the city, we can bet on the most probable outcome. If we were asked to pick up 1 adult randomly and asked what his/her (assuming gender does not affect height) height would be? There’s no way to know what the height will be. Suppose in a city we have heights of adults between the age group of 20-30 years ranging from 4.5 ft. By this, we mean the range of values that a parameter can take when we randomly pick up values from it.Ī probability distribution can be discrete or continuous. Even if you are not in the field of statistics, you must have come across the term “ Normal Distribution”.Ī probability distribution is a statistical function that describes the likelihood of obtaining the possible values that a random variable can take.
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