Solution :
Let 
be the unit vector in the direction parallel to the plane and let 
be the component of F in the direction of 
and 
be the component normal to .
Since, 
Therefore, 
From figure,
We know that the direction of 
is opposite of the direction of , so we have
The unit vector in the direction normal to the plane, 
has components :
Therefore, 
From figure,
∴ 
Therefore,
1 out of 52. So 1/52 equals some decimal. Plug in calc.
No more than 74 on average of 5 games means no more than 370 shots on total. If you add all of the numbers up you will get 292, so he can still shoot 370-292=78 in the last round, which is answer choice B.
