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How to Calculate 25th Percentile in Excel: A Step-by-Step Guide Calculating percentiles is a common task in data analysis, and Excel provides several functions to help perform this task. One of the most commonly used percentiles is the 25th percentile, which is also known as the first quartile. The 25th percentile is the value below which 25% of the data falls. In other words, if you have a set of data, the 25th percentile is the value that separates the bottom 25% of the data from the