Statistics Maths Help

A study at an amusement park found that, of 10000 families at the park, 1500 has brought one child, 1830 had brought two children, 2250 had brought three children, 1530 had brought four children, 1470 had brought five children, 950 had brought six children, and 470 had not brought any children.

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