Question 1105071
a.  0.75^12=0.0317
b.  From the calculator, probability is 0.9999 that 9 or fewer have
For 10, 66*0.25^10*0.75^2=0.000035
For 11 it is 12*.25^11*.75=0.000002
c. E(x)=x*p(x)=12*0.25=3