The upper quartile of a set of data is a number that a. separates the bottom half of the data set from the upper half b. finding the mean of the data set remaining after removing the lower half c. separates the lower quarter of the data set from the upper three-quarters d. separates the lower three-quarters of the data set from the upper quarter

D. separates the lower three-quarters of the data set from the upper quarter

Explanation:

The upper quartile is a line or a point that divides the upper half of a set of data in two exact parts, so when you get the median of the whole set of data, you take the upper half and calculate the median of that upper half, dividing the upper half in quartiles, and you get the division between the upper quartile and the other three quartiles.

  B. Solution

Explanation:  According to the question statement, Susan wrote in her notebook that it was a blue liquid. Therefore, from a chemistry point of view, it was a solution and not a heterogeneous mixture. Then, the solvent was evaporated after leaving the solution for 72 hours at the windowsill. The solute (blue color most likely) however was not able to evaporate with solvent and left behind.

Example: if you leave the KMnO4+water solution for a few days, water will evaporate thus leaving behind purple crystals of KMnO4.