These Tables Provide Data_Intro

1. These Tables Provide Data- Introduction In our day to day life, we see various kinds of tables which consist of numbers, figures, names, etc. These tables provide ‘Data’. Data is a collection of numbers gathered to give some information. In this chapter, we will look at some common forms of data that you come across. Recording Data Each and Every data can be collected from different sources. Recording of data depends upon the requirement of the data. Everybody has different ways to record data. It is possible only when we adopt some suitable system of collecting data. Organization of Data

2. Raw data is difficult to read, so we have to organize it in such a way so that we can use it in need. If we want to get any type of particular information from the given data quickly, data can be organized in a tabular form The data is represented in a tabular form using frequency distribution and the tally marks. Concepts of Data Handling Meaning of Range The difference between the highest and lowest observations in a given data is called its range. Mean or Arithmetic Mean: Average is a number that represents or shows the central tendency of a group of observations or data. Arithmetic mean is one of the representative values of data. The average or Arithmetic Mean (A.M.) or simply mean is defined as follows: Define Mode: Mode is another form of central tendency or representative value. The mode of a set of observations is the observation that occurs most often. Median: Median is the middle most observation of the data arranged in ascending or descending order. Bar Graph: A bar graph is a representation of numbers using bars of uniform widths.

3. Double bar graphs: It help to compare two collections of data at a glance. Meaning of Probability A coin has two sides, either Head or tail. So, when you toss the coin, either Head or tail may come. But, you can’t predict whether head or tail will come. There is a chance that Head may come when you toss the coin. Similarly, there is chance for tail to come So, the situation which may or may not happen, is said to have a chance of happening. This means that there is a chance for head to come or not come. This is called chance of happening. Important Note: The probability of an event which is certain to happen is ‘1’. The probability of an event which is impossible to happen is ‘0’.