title: Marginal Distribution for three random variables
body: <p>How can I find the marginal probability distributions of P(F),P(C),andP(S)???</p>
  <p><a href="https://i.stack.imgur.com/dmLDN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dmLDN.png" alt="enter image description here" /></a></p>