Things You'll Need. Calculator. Instructions. Add 1 to the number of items in your data set. For example, if your data set has 23 items, add 1 to 23 to get 24. Multiply the result
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The upper quartile is the 75% point of the variable. That is, it is the point with 75% of the observations below it and 25% of the observations above it. The upper quartile is the
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The third quartile (designated Q3) = upper quartile = cuts off highest 25% of data, or
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It's easy to find out: just plug in the sequence 1, 2, 3, 4, 5 and ask for the statistics. The first quartile comes back as 1.75. Therefore, it's picking a point between 1 and 2
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