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.
quartile. any of the three values that divide the range of a probability distribution into four parts of equal probability; the first, second, and third quartiles are the 25th, 50th, and 75th percentiles.uartile. any of the three values that divide the range of a probability distribution into four parts of equal probability; the first, second, and third quartiles are the 25th, 50th, and 75th percentiles.