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.
Definition. Quartile: a group that contains 25% of the data set. The first quartile (Q1) is that data below the lower quartile (LQ). The second quartile (Q2) is the data between the LQ and the median.The third quartile (Q3) is the data between the median and the upper quartile (UQ).efinition. Quartile: a group that contains 25% of the data set. The first quartile (Q1) is that data below the lower quartile (LQ). The second quartile (Q2) is the data between the LQ and the median.