ANSWERS: 1
  • [ Corrected! ] 25% of 40% = 10% of the class are red-headed women. 45% of 60% = 27% of the class are red-headed men. Out of every 100 students, 10 women and 27 men have red hair. Among redheads, women:men = 10:27 Probability that redhead is female = 10 / (10+27) = 10/37 = .2703 <--ANSWER Probability that redhead is male = 27 / (10+27) = 27/37 = .7297 Total probability = (.2703 + .7297) = 1 as expected.

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