product supply
The safety-supply is direct related at the deviation of the sales. For a calculation of this deviation are a few formulas integrated in almost every scientific- and financial calculator, so called the standard deviation, splicing in two directions. The maindirection goes to a deviation of the population, which means the complete amount, the total collection. The symbol on the tastature is .

The second direction is the deviation of the partial collection. This gives a deviationvalue of a specific part of the total collection . On the button of your calculator is the next symbol written: .

One of the functions of this formulae lays in the area of mathematics with enquettes (interviews), or better to say the expected deviation of the prognostic results of enquettes. In this function the population means a total of people or group of questions, and a partial collection a specific group of people or questions. This factor can be replaced by economic factor material in stock.
 
 
 
 
 
 

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