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.
Quartiles are percentiles that divide the data into fourths. A quartile is a number, it is not a range of values. A value can be described as above or below the first quartile, but a value is never in the first quartile. Consider: Check out this five statistical summary for a set of tests scores.uartiles are percentiles that divide the data into fourths. A quartile is a number, it is not a range of values. A value can be described as above or below the first quartile, but a value is never in the first quartile. Consider: Check out this five statistical summary for a set of tests scores.