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.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.