<PRE><B>Question 1120595</B>
For 3, it is 12C3*0.39^3*0.61^9=0.1526

At least 4 is 1- prob (3), (2),1, and 0.
This is 1-0.2472=0.7528

8 voters has probability of 0.03667
9 probability is 0.0104
10 prob. is 0.0020
11 prob is 0.0002
12 prob is 0
The answer is 1-0.0493=0.9507,
same as binomcdf(12,0.39,7)
</PRE>