<span>minimum = 4 </span> <span>maximum = 20 </span> <span>median = (10 + 11) / 2 = 10.5 </span> <span>first quartile is median of: {4, 6, 8, 10} or 7 </span> <span>third quartile is median of: {11, 12, 18, 20} or 15 </span>
<span>now perform the same steps on the second set of data values </span> <span>{60, 50, 130, 200, 180, 150, 100, 140}
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We can see from this survey that 7 teenagers prefer rock and roll. The number of all teenagers in the survey is: 12 + 5 + 7 + 6 + 6 + 4 = 40 P ( rock ) = 7 / 40 Answer: C ) 7 / 40