Statistics 1

We know that statistics deals with data collected for specific
purposes. We can make decisions about the data by analysing and interpreting it. In earlier classes, we have studied methods of representing data graphically and in tabular form. This representation reveals certain salient features or characteristics of the data. We have also studied the methods of finding a representative value for the given data. This value is called the measure of central tendency.
Recall mean (arithmetic mean), median and mode are three measures of central tendency. A measure of central tendency gives us a rough idea of where data points are centred. But, in order to make better interpretation from the data, we should also have an idea of how the data are scattered or how much they are bunched around a measure of central tendency.