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math 1530

3-2: Measures of center

Measure of center The value at the center or middle of a data set
Arithmetic Mean(Mean) the measure of center obtained by adding the values and dividing the total bythe number of values. (What most people call an average)
Median middle value whne the original data values are arranged in order of increasing (or decreasing) magnitude
Mode value that occurs with the greatest frequency, can have 1, more than 1, or no mode
Midrange the valuse midway between the maximum and minimum values in the original data set. midrange= (maximum value + minimum value) divided by 2
Weighted Mean When data values are assigned different weights, we can compute a weighted mean
Symmetric distribution of data is symmetric if the left half of its histogram is roughly a mirror image of its right half
skewed distribution of dara is skewed if it is not symmetric and extends more to one side than the other
Skewed to the left (also called megatively skewed) have a longer left tail, mean and medial are to the left of the mode
Skewed to the right (also called positively skewed) have a longer right tail, mean and medial are to the right of the mode
Created by: crickie11