July 2019
Beginner to intermediate
740 pages
16h 52m
English
Content preview from Hands-On Data Analysis with Pandas
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Mean
Perhaps the most common statistic for summarizing data is the average, or mean. The population mean is denoted by the Greek symbol mu (μ), and the sample mean is written as 
(pronounced X-bar). The sample mean is calculated by summing all the values and dividing by the count of values; for example, the mean of [0, 1, 1, 2, 9] is 2.6 ((0 + 1 + 1 + 2 + 9)/5):
We use xi to represent the ith observation of the variable X. Note how the variable as a whole is represented with a capital letter, while the specific observation is lowercase. Σ (Greek ...
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