Statistics

Statistics deals with data collected

Statistics deals with data collected for a specific purpose. Data can be arranged in tabular or graphical form, and statistical methods help in analys

Mean

Mean, median, and mode are the three measures of central tendency. They give a rough idea of where the data is centred.

Range of a series = Maximum

Range of a series = Maximum value – Minimum value. It is the simplest measure of dispersion and depends only on the extreme values.

Mean deviation is the mean

Mean deviation is the mean of the absolute values of deviations from a central value. For ungrouped data, M.D.(a) = \frac{\sum_{i=1}^n |x_i - a|}{n}.

Mean deviation about mean and median

Mean deviation about mean and median are the commonly used forms. Mean deviation about the mean is not very scientific because the sum of absolute dev