How to calculate first and third quartiles

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Quartile calculator Q1, Q3 (statistics)

The first quartile Q 1 is the median of the lower half not including the value of Q 2. The third quartile Q 3 is the median of the upper half not including the value of Q 2. How to Calculate Quartiles. Order your data set from lowest to highest
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Interquartile Range (IQR): What it is and How to Find it

One can use the below code to calculate the quartiles and median of a sorted list (because of sorting this approach requires computations where is the number of items).

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Quartile Calculator

Interquartile Range = Q3 – Q1. What it basically means is that in a data set with N data points: ( (N+1) * 1 / 4) th term is the lower quartile. ( (N+1) * 2 / 4) th term is the middle quartile. ( (N+1) * 3 / 4) th term is the upper quartile.

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Quartile Formula

There are four different formulas to find quartiles: Formula for Lower quartile (Q1) = N + 1 multiplied by (1) divided by (4) Formula for Middle quartile (Q2) = N + 1 multiplied by (2)

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