Sunnybrook Hospital is conducting a blood drive because its supply of group O blood is low, and

Question:

Sunnybrook Hospital is conducting a blood drive because its supply of group O blood is low, and it needs 177 donors of group O blood. If 400 volunteers donate blood, estimate the probability that the number with group O blood is at least 177. Forty-six percent of us have group O blood, according to data provided by Canadian Blood Services.