Before dealing with two higher population moments, namely with the skewness and the kurtosis, let's briefly discus the normal and standard normal distributions.
The normal distribution is the most important distribution in statistics. The shape of this distribution is the famous bell curve. A normal distribution is symmetric, with more observations close to the middle than in the tails. In honor of Karl Friedrich Gauss, the distribution is also called the Gaussian distribution, and the curve the Gaussian curve.
The formula for the normal distribution includes the mean and the standard deviation:
If you do not know ...
