CHAPTER X 



CREAMERY CALCULATION 



Find the Average Per Cent of Fat. In calculating the average 

 per cent of fat from a number of cows, or the milk furnished by 

 the different patrons, the mistake of adding the tests of all the 

 samples together and dividing the sum by the total number of 

 samples tested is often made. Milk from different patrons, or 

 from different cows, will always vary, both in quality and in 

 quantity, and in order to get a correct average test, both quan- 

 tity and quality must be taken into consideration. The wrong 

 way of calculating the average percentage may be illustrated as 

 follows : 



The average test, according to the wrong method =4 per cent. 



The correct way of calculating the average percentage may 

 be illustrated as follows : 



The average test, according to the correct method, is 3.42 

 per cent. 



It will be seen from the example quoted that there is a differ- 

 ence of more than .5 per cent. If the percentage of fat or the 



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