0–5 and 5–10 would not be sensible groups as there is an overlap and 5 belongs in two class intervals. Once finished, the table is known as a grouped frequency chart. Here is the data from a ...

The purpose of this study was to introduce reference intervals for CK in athletes. Method: CK was assayed in serum samples from 483 male athletes and 245 female athletes, aged 7–44. Samples had been ...