![]() ![]() If you have another value which reflects the quantum of variation in values, your understanding of a distribution improves considerably. Knowledge of only average is insufficient. In Rahim’s family, differences are higher and in Maria’s family, the differences are the highest. You can see that in Ram’s family, differences in incomes are comparatively lower. To understand it better, you need to know the spread of values also. They go into details and gather the following data: Do you notice that although the average is the same, there are considerable differences in individual incomes? It is quite obvious that averages try to tell only one aspect of a distribution i.e. ![]() They are a little surprised since they know that Maria’s father is earning a huge salary. ![]() She calculates that the average income in her family too, is Rs 15,000. Maria says that there are five members in her family, out of which one is not working. Rahim says that the average income is the same in his family, though the number of members is six. Ram tells them that there are four members in his family and the average income per member is Rs 15,000. During the course of their conversation, they start talking about their family incomes. Three friends, Ram, Rahim and Maria are chatting over a cup of tea. In this chapter you will study those measures, which seek to quantify variability of the data. However, that value does not reveal the variability present in the data. In the previous chapter, you have studied how to sum up the data into a single representative value. ![]()
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