CHAPTER X 



CREAMERY CALCULATION 



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

 per cent of fat from a number of cows, or the milk furnished 1j_\- 

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

 samples together and diA'iding tJie sum by the total number of 

 samples tested is often made. ]\Iilk from different patrons, or 

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

 c^uantity, 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 a\X'ragc test, according to the wrong method =4 per cent. 



The correct way of calculating the a^'erage percentage ma\" 

 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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