In the study of a new anti-hypertensive medication, age is measured at baseline (or the start of the study before any treatment is administered). The age data for the 15 participants are as follows: 33 24 45 52 49 63 57 79 56 34 56 52 72 67 70 Which column below (A, B, C or D) is the correct frequency distribution based on the age data above? A B C D Class Frequency Frequency Frequency Frequency (21-30) 3 2 1 1 (31-40) 3 2 2 1 (41-50) 3 3 2 2 (51-60) 2 3 5 2 (61-70) 3 3 3 5 (71-80) 1 2 2 4 A B C D