In case you didn't realize, Donald Trump Jr.'s "success" is due to his father's "success," and doesn't have much to do with his own intelligence. He proved that on Twitter earlier today, when he made a very incorrect statement about how math works.

This morning, a professor and writer named Justin Wolfers tweeted a clip of an article about how a lot of ACT scores in Illinois have dipped below average. "Reporter discovers many test scores are below the average test score. Outrage ensues," Wolfers wrote.

Reporter discovers many test scores are below the average test score. Outrage ensues. (HT @dwschanz) pic.twitter.com/JCpkAZMu9U
— Justin Wolfers (@JustinWolfers) October 31, 2017

It's unclear how Donald Trump Jr. came across this tweet, but he took it upon himself to respond with a blatantly incorrect observation.

I would imagine that 50% are below average... that's how math works. The real question is what is average now vs before common core. https://t.co/OnwYhzS7iU
— Donald Trump Jr. (@DonaldJTrumpJr) October 31, 2017

The distinction between means and medians is part of the (6th grade) common core standards. Irony of the day? https://t.co/dgGQix3YDZ
— Peter B. Bach, MD (@peterbachmd) October 31, 2017

That’s not how averages work. https://t.co/DFXTsVpP6i
— Matthew Yglesias (@mattyglesias) October 31, 2017

What percentage of your family is going to jail? I would imagine 50%, that’s how corruption works.
— Jenny Glonek (@Jglo) October 31, 2017

Don't get too haughty about math terms until you do a bit more research into what they mean.
— Grave💀Skeleton (@DaveStinton) October 31, 2017

Or what they median! Haha
— ZachScary M. (@DiracDeltaForce) October 31, 2017

You clearly don't understand testing, math, or averages.
Did you attend same "fine schools" as your father?
Study before tweeting.
— Barend Hamm PhD (@Bareham2016) October 31, 2017

Oh duh you got into college the same way your dad did so that explains the lack of understanding
— CurlsYourFriend (@curlsmcgee7) October 31, 2017

I think Junior is finally coming out as below average. Good for him.
— (((Seth))) (@SethWmJohnson) October 31, 2017

Very good genes. Very smart people.
— J. Ernesto Huacuja (@tiosulfato) October 31, 2017

Donald Trump Jr.'s current pinned tweet actually sums this all up best: "Life is hard; it’s even harder when you're stupid."

Life is hard; it’s even harder when you’re stupid. pic.twitter.com/rpS7svtfvf
— Donald Trump Jr. (@DonaldJTrumpJr) October 29, 2017

Donald Trump Jr. brags about his math skills. One problem.