you look on your y axis the one that's horizontal and get 75% of that number and go along that number on your graph till it reaches your line of best fit then go down. anything above that line is your upper quartile
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Subtract the lower quartile from the upper quartile.
U find the upper quartile by going to ur data and finding the median by ur median and the lower or upper extreme
Step 1: Find the upper quartile, Q3.Step 2: Find the lower quartile: Q1.Step 3: Calculate IQR = Q3 - Q1.Step 1: Find the upper quartile, Q3.Step 2: Find the lower quartile: Q1.Step 3: Calculate IQR = Q3 - Q1.Step 1: Find the upper quartile, Q3.Step 2: Find the lower quartile: Q1.Step 3: Calculate IQR = Q3 - Q1.Step 1: Find the upper quartile, Q3.Step 2: Find the lower quartile: Q1.Step 3: Calculate IQR = Q3 - Q1.
See related link. Upper and lower quartiles are the 75 and 25% percentile measures.
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 upper 25% of the data.