Tin has long been used in alloys with lead as solder, in amounts 5 to 70% w/w. Tin with lead forms a eutectic mixture at the weight proportion of 61.9% tin and 38.1% lead (the atomic proportion: 73.9%
The first quartile (Q 1) is defined as the middle number between the smallest number and the median of the data set.
What is inter-quartile range (iqr) - Definition and Meaning. Inter-quartile Range (IQR) : It is used for the statistical calculations of set of data which is divided into 4 equal parts. IQR is the difference between the third and first quartiles. Formula : IQR = Q3 â Q1, here Q3 is third quartile, Q1 is first quartile.