This depends on the task you have done.  Participating in a stake based bounty campaign have a chance of hitting a jackpot or hitting nothing.  There had been a lot of project that never paid their participants.  While those who paid have their token worthless.  If you ask me, participant getting $6.8 for 6 weeks of part time task is lucky, but I am not saying that the amount is enough.   And in my experience in assisting in calculation of payment, having that amount is normal especially when they are participating in telegram, facebook, and twitter bounty since there are lots of them joining the campaign and the allocation of fund is fixed. 

Fyi, joining bounty campaign is like gambling, sometimes you hit jackpot sometimes you don't.  If you are not comfortable with this, then better to forget about joining the bounty campaign.