Question

The upper quartile is calculated as the value at the 75th percentile, and the interval 6.8-6.9 contains this data point. rephrase like a 8th grader

Answer 1

The upper quartile is the number you get when you find the 75th percentile, which means it's a value that separates the top 25% of the data from the rest. In this case, the number that falls in that range is between 6.8 and 6.9.