The choice when expressing numbers is between using a word to express the number (e.g., three) or a figure (e.g., 3).  Please check whether or not the number is expressed correctly.  Then  highlight the rule that governs the use of the number in this instance.

There were 13 males and 30 females in the read only group with a mean age of 26.53 (and a standard deviation of 8.32) and there were two males and 44 females in the note-taking group with M = 29.56 (SD = 11.22).

The expression of the number is   correct     incorrect       because: