In a busy coffee shop which is a member of an international

In a busy coffee shop, which is a member of an international chain of coffee shops, 40% of customers order a pastry in addition to their drink. If 20 customers were selected at random during one business day, what is the probability that at least 11 of them did not order a pastry with their drink. Round your answer to 4 decimal places.

n = 20
k = x equal or more than 11 (\"at least\")
p = 1-0.4 = 0.6

1- binomcdf (20, 0.6, 10) = 0.7553