Answer:






Step-by-step explanation:
The variables have been defined in the question as:




Also, we have the following given parameters:




The solution is as follows:


Substitute values for P(F) and P(R)




Substitute values for P(F) and P(R-)





Substitute values for P(F) and P(R-)


<em>This implies that both events are independent</em>


Substitute values for P(F-) and P(R)




Substitute values for P(F-) and P(R-)



<em>--- Given</em>