5.2  Normal distribution

　

	Normal distribution - Standard “bell-shaped” or Gaussian distribution. It has two parameters called the mean and variance.
	Cumulative distribution - A function that maps each value of a random variable to the probability that the random variable is less than or equal to that value. The function begins at 0 and rises to 1 as you move to the right (or, less commonly from 1 to 0 as you move to the left). Cumulative plot of frequency distribution showing percentiles

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