Review of Introductory Mathematics AVERAGESAverageValueThe summation symbol, , introduced in the first chapter, is often used when dealing with theaverage value, .xUsing the first example in this chapter, the average value could have been expressed in thefollowing manner:x_{car}Nx_{ }_{i}i 1Nwhere:= the average value (cost) of a carx_{car}x_{i}= each of the individual car pricesN = total number of carsThe right side of the above equation can then be rewritten.x_{car}x_{1}x_{2}x_{3}x_{4}x_{5}x_{6}6substituting 10,200 for x_{1}, 11300 for x_{2}, 9,900 for x_{3}, etc.x_{car}10,20011,3009,90012,00018,00076006= 11,500x_{car}Rev. 0 Page 21 MA-01

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