Question 1132283
6C3*0.18^3*0.82^3=0.0643

at most one sale means one or 0.  For 0, it is 0.82^6=0.3040
for 1 it is 6*0.18*0.82^5=0.4004
The probability is 0.7044

At least 2 sales is the complement to at most 1, and that would be 1-0.7044 or 0.2956

Mean is np=6*0.18=1.08
sd is sqrt (np(1-p))=sqrt (1.08*0.82)=0.9411