It is known that 30% of people in a country wear glasses. From the (very large) population of that country, they randomly select a sample of 20 people. What is the probability that there are more than 8 glasses wearers in this sample?

a) 88.7%

b) 77.2%

c) 4.8%

d) 11.3% (--> Correct but how to solve it?)

e) 22.8%