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.
The Inter-quartile range is the range of the middle half of the data. It is the difference between the upper and lower quartile. Example: 35,80,100 110,120,120,170,180. The Inter-quartile range would be 145-90 or 55. To find the interquartile range, you: 1) Arrange the data in numerical order.