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Merrill is a co-founder of Food52.
There are usually 20-25 mussels in a pound, and you'll want 1/2 to 3/4 pound per person.
amysarah is a trusted home cook.
Also depends on whether it's a starter or main course. For the latter, I'd definitely figure 3/4 pound (9-10 lbs total) - especially since there are invariably some dead ones you'll end up tossing when you clean them.
I'd also go back a step and try to find P.E.I. mussels, but maybe (just maybe) I'm biased. ;)
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