As part of a class project, a university student surveyed the students in the cafeteria lunch line to look for a relationship between eye color and hair color among students. The table below contains the results of the survey. Eye Color Hair Color Blue Gray Green Brown Marginal Totals Blond 42 5 21 10 78 Red 12 22 19 12 65 Brown 22 5 12 34 73 Black 9 3 11 64 87 Marginal Totals 85 35 63 120 303 From the sample population of students with gray eyes, what is the relative frequency of students with red hair? A. 0.07 B. 0.12 C. 0.34 D. 0.63
"From the sample population of students with gray eyes, what is the relative frequency of students with red hair?" so we are only interested in the gray eyed population, look at the table to see how many students have gray eyes "what is the rel. frequency of students with red hair" out of that population, see how many students have red hair AND gray eyes then it's simply (gray-eyed students w/ red hair)/(total # of gray-eyed students)
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