The bell curve distribution for IQ scores tells us that two thirds of the world’s population have an IQ somewhere between 85 and 115.

IQ分数的正态分布图告诉我们世界上三分二的人智力在85-115之间。

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A normal distribution is the classic bell curve that appears so frequently in statistics.

正态分布是典型的钟形曲线，这在统计学中经常出现。

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India is like China in 2001, says Ms Vittal. “After two decades of systemic growth, the whole bell curve of income distribution moves to the right.”

维塔尔表示，当前的印度和2001年时的中国差不多。“经过20年的全面增长，收入分布的正态曲线整体右移。”

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In other words, if we cured all diseases and prevented all accidents, people would still die (of old age) in a narrow bell curve distribution centered on 85.

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This non-linear tendency is why complex systems are more likely to follow a power-law probability distribution than the more familiar bell-curve distribution.

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In a bell-curve distribution of probabilities, the range of possible events are clumped together around the average.

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