Click to draw/clear town borders. Notable locations in Westfield: Westfield Station (A), Echo Lake Golf Course (B), Westfield Volunteer Rescue Squad (C), Union County Fire Science Training Academy (D), Westfield Fire Department Station 2 (E), Westfield Rescue Squad (F), Westfield Fire Department Station 1 (G).
A distribution is said to be symmetric if the relative frequency (or probability) is the same the same distance either side of its centre, m. Mathematically, the distribution of X-m is then the same as the distribution of m-X.The mean and median of a symmetric distribution are equal.The most important symmetric distribution is the normal distribution, which is unimodal and therefore is symmetric about the mode.athematically, the distribution of X-m is then the same as the distribution of m-X. The mean and median of a symmetric distribution are equal. The most important symmetric distribution is the normal distribution, which is unimodal and therefore is symmetric about the mode.
Frequency Distributions. A frequency distribution is one of the most common graphical tools used to describe a single population. It is a tabulation of the frequencies of each value (or range of values).There are a wide variety of ways to illustrate frequency distributions, including histograms, relative frequency histograms, density histograms, and cumulative frequency distributions. Relative frequency histogram constructed by assigning the relative frequencies as heights of the rectangles. 2  Sum of all relative frequencies in a dataset is 1. 3  Similar to frequency histogram except heights of rectangles are calculated by dividing relative frequency by class width.