'The P-value for a hypothesis test indicated that a result at least this extreme would occur in two out of every three samples if the null hypothesis was true'

Deduce the P-value for this test and explain what a p-value measures.

I know it measures the probability of a result at least as extreme as the one that was observed but im a litte unsure on how to calculate it, im sure this is just a simple calculation, but ive come a little unstuck.

I guess its 2/3 = 0.66

So is that my p-value ?