* Learning disabilities and other challenges: An IQ score doesn't reveal the whole picture. Someone with an IQ of 78 might have specific learning disabilities that, with proper support and accommodations (like an IEP or 504 plan), could be mitigated.
* Motivation and support system: A supportive family, dedicated teachers, and the student's own determination can make a huge difference.
* Curriculum and school resources: The rigor of the high school curriculum and the availability of resources like tutoring and special education programs greatly impact a student's success.
Therefore, while it's statistically less likely for someone with an IQ of 78 to graduate high school compared to someone with a higher IQ, it's certainly possible with the right support and circumstances. It's important to remember that IQ scores are just one measure of ability, and they don't fully predict a person's potential.