EXAMPLE of a Normal Distribution
A certain species of pine tree has an average adult height of 20 feet, with each standard deviation representing 1 foot. The conclusion from the distribution below is that 68% of all trees of this species will reach a height between 19 and 21 feet (1 standard deviation), 95.5% will be between 18 and 22 feet (2 standard deviations), and 99.7% will be between 17 and 23 feet (3 standard deviations)