Question 1161871
this would be 0,1,2 tornadoes
for 0 it would be 0.98^18=0.6951
for 1 it would be 18*0.98^17*0.02=0.2554
for 2 it would be 18C2*0.98^16)*0.02^2=0.0443
0.9948 is the sum of the three and the probability.

or 2nd VARS scroll down to binomcdf ENTER (18,0.02,2)=0.9948. (n,p,x)