Twenty students take an exam. The percentages of questions they answer correctly are ranked from lowest to highest as follows:
32 49 57 58 61
62 64 66 67 67
68 69 71 72 72
74 76 80 82 83
In a frequency distribution from 30% to 90% that is divided into six equal-sized intervals, the absolute frequency of the sixth interval is:
A) 2.
B) 3.
C) 4.
Answer: B