Assuming that no other vertical forces act on the boarder or board and the resultant force is zero, yes.
Might want to use g = 9.81 if your spec requires it.
Thanks was abit unsure as we haven't done this in class yet. My teacher said it doesn't matter if use 9.8 or 9.81 because the gravitational force varies from 9.79 - 9.82 depending on where you live.