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My father came to my school to present to my 2nd grade class when I was a kid. He was teaching us about data and variation by rolling dice. He started by having each of the kids roll a die then he was going around the room asking them to say what number they rolled. I knew 1-6 should appear at close to equal rates. A very surprising number of 6s were being reported.

Dad decided to change the process and had the kids roll one at a time while he watched and recorded the number. The data from the 2nd process was more normal.

It turns out kinds are not the only ones that inflate their roll on dice.

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