"A bell curve, also known as a [[normal distribution]], is a symmetrical, bell-shaped curve that represents the distribution of data in statistics. Standard deviations measure the spread or dispersion of data points around the [[mean]] (average) of a normal distribution. In a normal distribution, roughly 68% of the data falls within one [[standard deviation]] of the mean, 95% within two standard deviations, and 99.7% within three standard deviations."<ref>[https://www.google.com/search?q=normal+bell+curve+and+standard+deviations&oq=normal+bell+curve+and+standard+deviations&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIICAEQABgWGB4yCAgCEAAYFhgeMggIAxAAGBYYHjIICAQQABgWGB4yCggFEAAYChgWGB4yCAgGEAAYFhgeMggIBxAAGBYYHjINCAgQABiGAxiABBiKBTIGCAkQLhhA0gEJMjc3MDlqMGoxqAIAsAIA&sourceid=chrome&ie=UTF-8 Normal bell curve and standard deviations]</ref> | "A bell curve, also known as a [[normal distribution]], is a symmetrical, bell-shaped curve that represents the distribution of data in statistics. Standard deviations measure the spread or dispersion of data points around the [[mean]] (average) of a normal distribution. In a normal distribution, roughly 68% of the data falls within one [[standard deviation]] of the mean, 95% within two standard deviations, and 99.7% within three standard deviations."<ref>[https://www.google.com/search?q=normal+bell+curve+and+standard+deviations&oq=normal+bell+curve+and+standard+deviations&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIICAEQABgWGB4yCAgCEAAYFhgeMggIAxAAGBYYHjIICAQQABgWGB4yCggFEAAYChgWGB4yCAgGEAAYFhgeMggIBxAAGBYYHjINCAgQABiGAxiABBiKBTIGCAkQLhhA0gEJMjc3MDlqMGoxqAIAsAIA&sourceid=chrome&ie=UTF-8 Normal bell curve and standard deviations]</ref> |