so, the outcomes are as follows:

You get $6 with probability 0.2

You get $0 with probability 0.8

Expected payoff = 0.2*6 + 0.8*0 = 1.2

So on average, you are getting $1.2 back for every $1 you put in, and you should take this bet.

I assume you are treating this as astatisticsproblem rather than an economics problem. If you are studying this in the context of an economics course the answer depends on how risk averse you are.