Interquartile Ranges (IQRs) & Outliers | Purplemath
2019-3-4 · That is, if a data point is below Q 1 – 1.5×IQR or above Q 3 + 1.5×IQR, it is viewed as being too far from the central values to be reasonable.Maybe you bumped the weigh-scale when you were making that one measurement, or maybe your lab partner is an idiot and you should never have let him touch any of the equipment.