$($NOTE: use the following information for questions $49-51)$

A jackal that occasionally provides food to a relative incurs a lifetime cost $($on average$)$ of one less offspring surviving to reproductive age. A jackal that occasionally receives food provisioning, however, incurs on average a lifetime benefit of $3$ more offspring surviving to reproductive age. Here, you'll determine whether you would expect to see a jackal provision a full sibling:

What is the coefficient of relatedness between the potential actor and its sibling?