Help me to understand this sentence

Please, someone can help me to understand the following sentence: Clean the data by filtering out days when the page views were in the top 2.5% of the dataset or bottom 2.5% of the dataset .

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Challenge: Page View Time Series Visualizer

Link to the challenge:

You got a dataset with pageviews - numbers. Those range from the lowest number (0% are lower) to the highest (100% are lower).
You are supposed to remove entries from the dataset below the 2.5% mark or above the 97.5%.
Did you do the medical-data challenge? The command is used there as well.