You know what, you are right. I was reading the page for neutrino wrong. I mistook the two words. It does say that neutrinos are candidates right here: https://en.wikipedia.org/wiki/Neutrino
WIkipedia says antineutrinos are candidates for dark matter. What does this mean? How is it a candidate, and how could an antiparticle even exist in large quantities in the universe? Or is it only meant to be a small piece of problem?
I think you might actually have the right answer, but you need to rearrange algebraically to solve for whatever it is you are supposed to have. I'm sorry it is hard to make out the photograph, but do you know what it is supposed to be?