Final answer:
The question requires calculating the probability of two scenarios regarding meat servings in a dining context and involves knowledge of probabilities in mathematics, not automatic side dishes for steaks or pork chops.
Step-by-step explanation:
The question posed looks at the probability of two different scenarios relating to meat servings in a dining context.
However, since it provides specific measurements and calls for an understanding of probabilities, the question falls under the mathematics category rather than culinary specifics.
The first probability mentioned, P(you will not get a chicken breast and you will get an 18-oz. pork chop), requires us to consider the chances of not receiving one type of meat (chicken breast) while concurrently receiving another specific type and size of meat (an 18-oz. pork chop).
The second, P(you will get a piece of meat that is not 21 oz.), asks us to calculate the probability of receiving any serving of meat provided it does not weigh 21 ounces.
To answer these probability questions accurately, one would need additional information regarding the number of different menu items and their respective servings sizes available in the hypothetical dining scenario.