On Halloween morning this year, I showed my Mathematics 10 students my histogram from last year. I asked my class to estimate how many trick-or-treators I had in 2022 based on the image (186) and to predict how many I would get this year. Last year was a beautiful fall night with temperatures of 14°C (57°F) and I had a record number of visitors... this year's weather was still clear but a bit chillier (4°C/39°F). I promised a prize (my leftover candy) to the student with the closest prediction. Students were eager to hear the result in class the next day. It turns out I had 181 trick-or-treators this year and I had two winners. One student guessed 172 and another guessed 190... both were 9 off. Candy was awarded and congratulations offered. Some of my neighbors visited to see how my data collection was going and one neighbor even had their daughter handing out treats and keeping track of their visitors with a hand held tally clicker. Perhaps next year, I can convince some of my students to also keep a tally at their house.
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