mix something up vs premix

mix something up

premix

verb
  • To blend in advance. 

noun
  • A blend of components that has been mixed in advance of use or of further processing. 

  • A manufactured beverage consisting of alcohol and soft drink, milk or other non-alcoholic drinks; an alcopop. 

How often have the words mix something up and premix occurred in a corpus of books? (source: Google Ngram Viewer )