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A campus program evenly enrolls (p = 0.5) undergraduate and graduate students. If a random sample of 4 students is selected from the program to be interviewed about the introduction of a new fast food outlet on the ground floor of the campus building, what is the probability that at least 3 students selected are undergraduate students?

a. 0.6875
b. 0.0625
c. 0.3125
d. 0.2500

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