Aptitude average

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The document contains examples of calculating averages from sets of numbers, as well as word problems involving averages. It provides formulas for calculating the average of a data set as the sum of all values divided by the number of values. It also gives a formula for calculating the average speed over a journey when distances are covered at different speeds. Several word problems then apply these concepts to scenarios involving students' exam scores, family incomes and ages, book and petrol prices, and more.

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