When Sahara runs the 400 m dash, finishing times are normally distributed with a mean of 84 seconds in a standard deviation of 1.5 seconds using the empirical rule, what percentage of races while her finishing time be between 81: 87 seconds?

Nour and rana are shopping for a christmas tree. they are deciding between 2 22 different types of trees (real and fake) and 4 44 colors for the ornaments (white, silver, gold, and purple). they each created a display to represent the sample space of randomly picking a type of tree and a color for the ornaments. whose display correctly represents the sample space?