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.
In descriptive statistics, the quartiles of a ranked set of data values are the three points that divide the data set into four equal groups, each group comprising a quarter of the data.A quartile is a type of quantile.The first quartile (Q 1) is defined as the middle number between the smallest number and the median of the data set. The second quartile (Q 2) is the median of the data. The third quartile (Q 3) is the middle value between the median and the highest value of the data set.he first quartile (Q 1) is defined as the middle number between the smallest number and the median of the data set.