The median ( Q2 ) divides the data set into two parts, the upper set and the lower set. The lower quartile ( Q1 ) is the median of the lower half, and the upper quartile ( Q3 ) is the median of the upper half. Example: Find Q1 , Q2 , and Q3 for the following data set, and draw a box-and-whisker plot.
The answer is c because ther is only one value for x which is -2.5
Since there are 5 possible outcomes and 3 is only one of the outcomes, the probability would be 1/5 or 20%
