Answer
$Q_1=-0.075$
$Q_2=0.02$
$Q_3=0.075$
$Q_1=-0.075$ means that 25% of the monthly rate of return is less than or equal to -0.075 and 75% of the monthly rate of return is greater than -0.075
$Q_2=0.02$ means that 50% of the monthly rate of return is less than or equal to -0.02 and 50% of the monthly rate of return is greater than 0.02
$Q_3=0.075$ means that 75% of the monthly rate of return is less than or equal to 0.075 and 25% of the monthly rate of return is greater than 0.075
Work Step by Step
In MINITAB, insert all the values of the table in the column C1.
Select Stat -> Basic Statistics -> Display Descriptive Statistics
Enter C1 in "Variables"
Click in Statistics.
Select "First Quartile", "Median" and "Third Quartile"
Click OK. Click OK.
$Q_1=-0.075$
$Q_2=median=0.02$
$Q_3=0.075$
