Pafnuty Chebyshev, looking stern, from Wikipedia. Most people that have studied a certain amount of statistics theory will likely have encountered the 68-95-99.7 rule. It could surely do with a more catchy name, but the point of it is to quickly express the proportion of values that should lie within 1, 2 and 3 standard deviations … Continue reading Chebyshev’s inequality – a 68-95-99.7 style rule for all distributions →