To calculate the Attack Rate, we need to divide the number of people who became ill by the total number of people who ate the roasted chicken, and then multiply the result by 100 to express it as a percentage.
The number of people who became ill after consuming the roasted chicken is 45, and the total number of people who ate the roasted chicken is 125.
Now, let's calculate the Attack Rate:
Attack Rate = (Number of people who became ill / Total number of people who ate roasted chicken) * 100
Attack Rate = (45 / 125) * 100
Attack Rate = 36%
Therefore, the Attack Rate for the roasted chicken at the dinner party is 36%.