ch5 - CHAPTER Measures of Central Tendency Studying this chapter should enable you to understand the need for summarising a set of data by one single

ch5 - CHAPTER Measures of Central Tendency Studying this...

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Measures of Central Tendency Studying this chapter should enable you to: • understand the need for summarising a set of data by one single number; recognise and distinguish between the different types of averages; learn to compute different types of averages; draw meaningful conclusions from a set of data; develop an understanding of which type of average would be most useful in a particular situation. 1. I NTRODUCTION In the previous chapter, you have read the tabular and graphic representation of the data. In this chapter, you will study the measures of central tendency which is a numerical method to explain the data in brief. You can see examples of summarising a large set of data in day to day life like average marks obtained by students of a class in a test, average rainfall in an area, average production in a factory, average income of persons living in a locality or working in a firm etc. Baiju is a farmer. He grows food grains in his land in a village called Balapur in Buxar district of Bihar. The village consists of 50 small farmers. Baiju has 1 acre of land. You are interested in knowing the economic condition of small farmers of Balapur. You want to compare the economic C HAPTER
MEASURES OF CENTRAL TENDENCY 5 9 2.above the size of what half thefarmers own (see the Medianbelow)3.above what most of the farmersown (see the Mode below2. ARITHMETICMEANSuppose the monthly income (in Rs)of six families is given as:1600, 1500, 1400, 1525, 1625, 1630.The mean family income isobtained by adding up the incomesand dividing by the number offamilies. )

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