Escherichia coli, a bacterium often found in the human digestive tract, can mutate from being streptomycin sensitive to being streptomycin resistant, which can cause the individual involved to become resistant to the antibiotic streptomycin. Assume that there is an average of two streptomycin-resistant bacteria on cultures drawn from a particular patient. Each culture has an area of 80 square centimeters. What is the probability that a one-square-centimeter random sample from a single culture will contain at least one resistant bacterium?