For Western Europe, the infant mortality rates reported by the Human Development Report 2006 were Sweden 3,

Question:

For Western Europe, the infant mortality rates reported by the Human Development Report 2006 were
Sweden 3, Finland 3, Spain 3, Belgium 4, Denmark 4, France 4, Germany 4, Greece 4, Italy 4, Norway 4, Portugal 4, Netherlands 5, Switzerland 5, UK 5.
Show that Q1 = Q2 = Q3 = 4. (The quartiles, like the median, are less useful when the data are highly discrete.)