What are the steps to find the lower and upper quartiles of a data set?

First, order the data values from least to greatest. Then find the median of the full data set; this divides the data into lower and upper halves. Find the median of the lower half for the lower quartile and the median of the upper half for the upper quartile. This matches choice D, “Order the values, find the median, then find the lower and upper quartiles.”

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