In an article from CNN discussing a recent conference in Vancouver about Alzheimer's disease, the reporter uses numbers in various ways to tell the story.
The numbers in the article are actually quite easy to understand, they are primarily numbers accumulated via surveys by researchers, so the reporter did not have to work very hard to make the statistics easier to grasp. She mainly used umbers when describing the findings about alcohol and its relation to dementia and Alzheimer's.
The reporter did not use any math to get her numbers. She basically copied the statistical data from the Alzheimer's Association as well as data compiled by other researchers from the conference.
The reporter appears to have found most of her information from the Alzheimer's Association as well as other studies mentioned in the article. She always attributed the statistical data to the source.