Oliver's family planted a tree on his 1st birthday. Each year the tree grows about the same amount. Oliver's

family has measured the height of the tree every year on his birthday, except they forgot to record its height on

his 5th birthday.

Oliver's Birthday 1st 2nd 3rd 4th 5th 6th

Height of Tree (ft)

5

12

1

1

2 3

1

4 4

2

3

? 7

4

12

Which measurement is the most reasonable estimate for the height of the tree on Oliver's 5th birthday?