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.
One of the three points that divide a range of data or population into four equal parts. The first quartile (also called the lower quartile) is the number below which lies the 25 percent of the bottom data.The second quartile (the median) divides the range in the middle and has 50 percent of the data below it.The third quartile (also called the upper quartile) has 75 percent of the data below it and the top 25 percent of the data above it. See also interquartile range and percentile.he second quartile (the median) divides the range in the middle and has 50 percent of the data below it.