Final answer:
The statement in the question is true; school zone speed limits are typically enforced from 8 a.m. to 5 p.m. on school days, set to ensure students' safety.
Step-by-step explanation:
The statement that a school zone speed limit is in effect from 8 a.m. to 5 p.m. on school days is true if this is the only information indicated on the sign. This time frame represents typical school hours and is aimed at ensuring the safety of students when they are most likely to be arriving at or leaving the school. It is important to always adhere to the posted speed limits, especially in school zones, and to be aware of any additional flashing lights or signs that may enforce differing time periods or reduced speed limits.