Arrange the data in ascending order
Find the minimum value
Find the first quartile
Find the median
Find the third quartile
Find the maximum value
Calculate the interquartile range if needed
Draw a number line
Mark the minimum, first quartile, median, third quartile, and maximum on the number line
Draw a box from the first quartile to the third quartile
Draw a line inside the box at the median
Draw whiskers from the box to the minimum and maximum values