How to calculate with r studio

Bird	Length
mdw_pippit	19.65
mdw_pippit	20.05
mdw_pippit	20.65
mdw_pippit	20.85
mdw_pippit	21.65
mdw_pippit	21.65
mdw_pippit	21.65
mdw_pippit	21.85
mdw_pippit	21.85
mdw_pippit	21.85
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.05
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.25
mdw_pippit	22.45
mdw_pippit	22.45
mdw_pippit	22.45
mdw_pippit	22.65
mdw_pippit	22.65
mdw_pippit	22.85
mdw_pippit	22.85
mdw_pippit	22.85
mdw_pippit	22.85
mdw_pippit	23.05
mdw_pippit	23.25
mdw_pippit	23.25
mdw_pippit	23.45
mdw_pippit	23.65
mdw_pippit	23.85
mdw_pippit	24.25
mdw_pippit	24.45
tree_pippit	21.05
tree_pippit	21.85
tree_pippit	22.05
tree_pippit	22.45
tree_pippit	22.65
tree_pippit	23.25
tree_pippit	23.25
tree_pippit	23.25
tree_pippit	23.45
tree_pippit	23.45
tree_pippit	23.65
tree_pippit	23.85
tree_pippit	24.05
tree_pippit	24.05
tree_pippit	24.05
hedge_sparrow	20.85
hedge_sparrow	21.65
hedge_sparrow	22.05
hedge_sparrow	22.85
hedge_sparrow	23.05
hedge_sparrow	23.05
hedge_sparrow	23.05
hedge_sparrow	23.05
hedge_sparrow	23.45
hedge_sparrow	23.85
hedge_sparrow	23.85
hedge_sparrow	23.85
hedge_sparrow	24.05
hedge_sparrow	25.05
robin	21.05
robin	21.85
robin	22.05
robin	22.05
robin	22.05
robin	22.25
robin	22.45
robin	22.45
robin	22.65
robin	23.05
robin	23.05
robin	23.05
robin	23.05
robin	23.05
robin	23.25
robin	23.85
wagtail	21.05
wagtail	21.85
wagtail	21.85
wagtail	21.85
wagtail	22.05
wagtail	22.45
wagtail	22.65
wagtail	23.05
wagtail	23.05
wagtail	23.25
wagtail	23.45
wagtail	24.05
wagtail	24.05
wagtail	24.05
wagtail	24.85
wren	19.85
wren	20.05
wren	20.25
wren	20.85
wren	20.85
wren	20.85
wren	21.05
wren	21.05
wren	21.05
wren	21.25
wren	21.45
wren	22.05
wren	22.05
wren	22.05
wren	22.25

In this question we will be using the Cuckoo dataset cuckoo