The correct notation for the mean of the y values is D)yÌ. The notation "yÌ" is commonly used to represent the mean or average of a set of y values. It is calculated by adding up all of the y values and dividing by the number of values in the set. For example, if we have the y values 2, 4, 6, and 8, the mean would be (2 + 4 + 6 + 8) / 4 = 5, so yÌ = 5. This notation is often used in statistics and data analysis to represent the central tendency of a set of data.