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 INTERQUARTILE RANGE. : the range of values of the variable in a statistical distribution that lies between the upper and lower quartiles.ADVERTISEMENT.inter- + quartile. the range of values of the variable in a statistical distribution that lies between the upper and lower quartiles. ADVERTISEMENT. inter- + quartile.