Question 1040427
a.  It is 9C5 (1/2)^5(1/2)^4; that is 126/512=0.2461
b.  It is (1/2)^9 or 1/512=0.002
c.  It is 9C8(1/2)^8(1/2)=9/512=0.0176
d. That is 1-probability none will return=512/512-1/512=511/512=0.998
e. The expected value is x*p(x)=9(1/2), or 4 1/2