Measures Of Central Tendency Quantitative Aptitude & Business Statistics Statistics in Plural Sense as Statistical data.  Statistics in Plural Sense refers to numerical data of any phenomena placed in relation to each other.  For example ,numerical data relating to population ,production, price level, national income, crimes, literacy ,unemployment ,houses etc.,  Statistical in Singular Scene as Statistical method. Quantitative aptitude & Business 2 Statistics: Measures Of Central According to Prof.Horace Secrist: By Statistics we mean aggregate of  “ facts affected to marked extend by multiplicity of causes numerically expressed, enumerated or estimated according to reasonable standard of accuracy ,collected in a systematic manner for a pre determined purpose and placed in relation to each other .” Quantitative aptitude & Business 3 Statistics: Measures Of Central Measures of Central Tendency Quantitative aptitude & Business 4 Statistics: Measures Of Central Def:Measures of Central Tendency  A single expression representing the whole group,is selected which may convey a fairly adequate idea about the whole group.  This single expression is known as average. Quantitative aptitude & Business 5 Statistics: Measures Of Central  Averages are central part of distribution and, therefore ,they are also called measures of central tendency. Quantitative aptitude & Business 6 Statistics: Measures Of Central Types of Measures central tendency: There are five types ,namely 1.Arithmetic Mean (A.M) 2.Median 3.Mode 4.Geometric Mean (G.M) 5.Harmonic Mean (H.M) Quantitative aptitude & Business 7 Statistics: Measures Of Central Features of a good average  1.It should be rigidly defined  2.It should be easy to understand and easy to calculate  3.It should be based on all the observations of the data Quantitative aptitude & Business 8 Statistics: Measures Of Central  4.It should be easily subjected to further mathematical calculations  5.It should be least affected by fluctuations of sampling Quantitative aptitude & Business 9 Statistics: Measures Of Central Arithmetic Mean (A.M) The most commonly used measure of central tendency. When people ask about the “average" of a group of scores, they usually are referring to the mean. Quantitative aptitude & Business 10 Statistics: Measures Of Central