Which is cheaper: eating out or dining in?

Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought at the grocery store is $13.04. A sample of 64 neighborhood restaurants showed a mean price of $12.75 and a standard deviation of $2 for a comparable restaurant meal. The null hypothesis is that the mean cost of restaurant meal is great than or equal to $13.04. The alternative hypothesis is that its mean cost is less than $13.04. Using the sample from the 64 restaurants, what is the p-value?