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Although it's hard to be definitive in classify- ing people as right- or left-handed, some studies suggest that about 14% of people are left-handed. since 0.14 * 0.14 = 0.0196, the multiplication rule might suggest that there's about a 2% chance that a brother and a sister are both lefties. what's wrong with that reasoning

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Kalahira
It's actually incredibly easy to classify a person as right or left handed. On top of that the 14% metric for a brother and sister comes in out of nowhere, there might be a different chance for both depending on genetic factors, whether they are twins, etc.

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