People with Type O-Negative Blood Are Universal Donors Whose Blood

Multiple Choice

People with type O-negative blood are universal donors whose blood can safely be given to anyone. Only 7.2% of the population has O-negative blood. A mobile blood center is visited by 20 donors in the afternoon. Let X denote the number of universal donors among them.
What is the probability that X is at least 2?

A) 0.224
B) 0.257
C) 0.427
D) 0.743