Suppose 10% of the flights arriving at an airport arrive early, 60% arrive on time, and 30% arrive late. Valerie used the random-number table to find the experimental probability that of 5 flights, at least 2 will arrive late. The digit 0 represents flights arriving early. The digits 1, 2, 3, 4, 5, and 6 represent flights arriving on time. The digits 7, 8, and 9 represent flights arriving late.

Question

65926, 31459, 31986, 65809, 80462
27387, 39075, 46738, 21986, 59837
91384, 10987, 26491, 68498, 98796
32596, 26448, 31235, 63256, 53121

Find the experimental probability that of 5 flights, at least 2 will arrive late.
3/10
2/5 <--
9/20
11/20

Am I correct? If not could you please explain.

Answer 1

of the 20x5 groups above, there are 11 with two or more late (**** means 2+late)
65926, 31459, ***31986, ***65809, 80462
***27387, ***39075, ***46738, ***21986, ***59837
***91384, ***10987, 26491,*** 68498, ***98796
32596, 26448, 31235, 63256, 53121

Pr=11/20