What percentage of the time do helmets prevent head injuries?
- 67% ✓
- 50%
- 99%
- None of the above
Answer: A. 67%
A helmet is effective in preventing head injuries in 67% of crashes.
Why this is the answer
The handbook's crash fact says helmets are effective in preventing head injuries in 67 per cent of crashes. The same passage also gives a separate figure for fatal injuries, saying helmets can prevent fatal injuries 29 per cent of the time. The question asks about head injuries, so the 67 per cent figure is the one that matches. The passage also says to wear your helmet every time you get on your motorcycle.
Why the other answers are wrong
- B. 50% — The passage does not give 50 per cent as a helmet figure; the head-injury figure it states is 67 per cent.
- C. 99% — The passage does not state 99 per cent for helmet protection against head injuries.
- D. None of the above — This is wrong because the passage does state a percentage: helmets prevent head injuries in 67 per cent of crashes.
Remember it
Link the helmet number to the phrase 'head injuries' in the crash fact, not to the fatal-injury number.