Refer to the table in the margin for n=8 and p=0.381. When a car buyer is selected at random, there is a 0.381 probability that he or she bought a used car (based on data from a CAA members' survey). In each case, assume that 8 buyers are randomly selected and find the indicated probability

x	P (x)
0	0.021554
1	0.106133
2	0.228640
3	0.281460
4	0.216551
5	0.106631
6	0.032816
7	0.005771
8	0.000444

18. Find the probability that at least 5 car buyers bought used cars.