A real estate agent has 4 homes for sale: A, B, C, and D. Here are the listing prices.

Home A: $150,000
Home B: $250,000
Home C: $190,000
Home D: $550,000

The agent wants to randomly select 2 of the 4 homes to show in an open house this coming weekend. This means the agent may show home A and B, A and C, A and D, B and C, B and D, or C and D. Which of the following gives the sampling distribution of the sample mean listing price for all possible samples of size 2 from this population of 4 homes?