A football team has attempted 6 running plays. The change in field position resulting from each play is shown in the table.

Running Play Outcomes
Play 1
–3 yards
Play 2
2 yards
Play 3
–1 yard
Play 4
–2 yards
Play 5
–3 yards
Play 6
1 yard

What is the average change in field position per running play?
–6 yards per play
–1 yard per play
0 yards per play
1 yard per play