Читать книгу Introduction to Statistical Process Control - Muhammad Amir Aslam - Страница 17

Statistics is the science used for the collection, presentation, analysis, and the interpretation of data. Descriptive statistics aims to describe various aspects of the data obtained in any data collection activity. The descriptive statistics consists of the listing, summary statistics, and the graphing of the collected data. The important measures of descriptive statistics are the mean, the median, the mode, the geometric mean, the harmonic mean, range, quartile deviation, mean deviation, variance, and standard deviation.

 i) The Mean

The mean is defined as the average of the data set. It can be defined as the value obtained by dividing the sum of the values by their numbers. It is denoted by . The formula for the calculation of the mean is