STAT-3090 Lecture Notes - Lecture 4: Xi Xi, Frequency Distribution, Weighted Arithmetic Mean

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Number of observations = x / i. Typically, we compare the center of distributions, the variability of the distribution, the shape of each distribution as well as any unusual characteristics such as gaps or outliers. We typically use mean or median to describe the center of a distribution. The mean (or average) is the sum of the observations divided by the number of observations. Represents the population mean s x um of all observations. Median observations must be in numerical order n is the number of observations in the dataset median is the middle value if n is odd median is the average of the middle two values if n is even. X = 3 + 0 + 2 + 0 + 1 +3 + + 4 + 0 / 24 = 2. 375 defects. The data from example 1 may be summarized by the following frequency distribution. We may find the mean of these summarized data by the following.

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