A study at an amusement park foundthat, of10,000 families at thepark, 1800 had brought onechild, 1890 had brought twochildren, 2440 had brought threechildren, 1370 had brought fourchildren, 1260 had brought fivechildren, 780 had brought sixchildren, and 460 had not brought any children.

Find the expected number of children per family at the amusement park.