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 of QUARTILE. : any of the three values that divide the items of a frequency distribution into four classes with each containing one fourth of the total population; also: any one of the four classes.ADVERTISEMENT.International Scientific Vocabulary, from Latin quartus.weet. : any of the three values that divide the items of a frequency distribution into four classes with each containing one fourth of the total population; also: any one of the four classes.