normal distribution

In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is The parameter ⁠⁠ is the mean or expectation of the distribution, while the parameter is the variance. The standard deviation of the distribution is the positive value ⁠⁠ (sigma). A random variable with a Gaussian distribution is said to be normally distributed and is called a normal deviate.