What is the percentile corresponding to the upper quartile in a five number summary of a data set?

The upper quartile, often referred to as the third quartile or Q3, represents the value below which 75% of the data falls in a data set. In a five number summary, which consists of the minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum, the upper quartile indicates that three-quarters of the data points lie at or below this threshold. Thus, if you are looking to determine the percentile corresponding to the upper quartile, it is indeed 75%. This means that 75% of the data is less than or equal to the value of the upper quartile, making it a vital reference point in statistical analysis and data representation.