The median for granite is 0.82.
Therefore, the difference between the median amount of gold in the granite and limestone samples is 0.82
– 0.45 = 0.37, and the correct answer is (B).
What Is a Mode?
The mode of a group of numbers is the number in the list that appears most often. In the list 3, 4, 4, 5, 7, 7,
8, 8, 8, 9, 10, the mode is 8, because it appears three times while no other number in the group appears
more than twice. Remember it this way: Mode sounds like most.
Mode is often tested with bar graphs or points on a scatterplot. Look for the tallest bar on the bar graph or
the row or column with the most points in a scatterplot to find the mode.
6.
The pH of the water in Lake Michigan was tested at 13 locations along the
Illinois shoreline. The data is presented in the scatterplot above. Which answer
choice best represents the mode of the pH in the collected data?
A) 7.2
B) 7.3
C) 7.4
D) 7.5Here’s How to Crack It
The mode is the data point that occurs most frequently. Each diamond is a data point, so look for the line