Скачать или смотреть How to find Mean (Direct Method) /Statistics

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Mean (or average) of observations, as we know, is the sum of the values of all the observations divided by the total number of observations. If x1, x2,… xn, are observations with respective frequencies f1, f2,, . . ., fn then this means observation x1, occurs f1 times, x2, occurs f2, times, and so on.


Direct method should be used when the given data is small. Assumed mean method for intermediate data and for huge data you can use Step deviation method.


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