Statistical analysis, Strictly on request

I don’t watch Strictly Come Dancing, the BBC’s hit reality dance show. I have seen an episode or two in the past, usually at family dinners when one or both of my grandmothers insisted we watch it. But despite my general lack of interest, I was delighted to see that Alexandra and Gorka, and Debbie and Giovanni had made it through to the final of series 15, just as Susan Connolly said they would.