I was reading a book on computer architecture for my exam and came across this table. I understand all the columns except for the ratio of means. How is the ratio of means of 10 and 100 become 91.8. I would really appreciate if someone can provide me with an explanation.

  • $\begingroup$ Can you add some more context or cite properly the book? $\endgroup$ – dcolazin May 6 at 10:29
  • $\begingroup$ Book: “Parallel Computer Organization and Design”Michel Dubois, Murali Annavaram, and Per Stenström. Page 21. The thing is there is no explanation of how the math was done in the book. I have uploaded the full page from the book: imgur.com/f7aa2LG & imgur.com/JDDkbga $\endgroup$ – Ashik Alim May 6 at 10:41

The column "ratios of means" is the ratio of arithmetic means of the reference and of the machines: so the first is "reference1"/"machine1" (5050/55), the second is "reference1"/"machine2" (5050/100.5), the third is "reference2/machine1" and so on.

  • $\begingroup$ Thank you for the perfect explanation. Should have uploaded the full page from the beginning! $\endgroup$ – Ashik Alim May 6 at 11:29

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