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QuestionHow do you find the upper and lower quartiles?Community AnswerUse the methods above to find the upper quartile. To find the lower quartile using the formula, use Q1 = 1/4(n+ 1), or enter 1 into the Excel function instead of 3.
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QuestionHow do I determine the inter quartile range of data?Cluster DuckCommunity AnswerThe IQR can be calculated by subtracting the lower quartile from the upper.
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QuestionHow do I calculate the upper quartile for a large group of numbers?Community AnswerSame as for a small group of numbers. Or better use script language like Matlab or Python to load the dataset and do the calculations.
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QuestionI have a set of data with an interquartile range of 20 and a lower quartile of 6. If the data is symmetrical, what is the value of the mean?VenatrixxCommunity AnswerBecause the data is symmetrical, the mean will have the same value as the median. Also, the upper and lower quartiles will be equally far from the median. The interquartile range of 20 and lower quartile of 6 imply that the upper quartile is 26 (20+6=26). The median will be halfway between the upper and lower quartiles at 16. Again, because the data is symmetrical, the mean will also be 16.
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