Final answer:
The experimental probability of selling a blueberry pie is 1/2.
Step-by-step explanation:
In this problem, we are given that Rihanna's pie shop sold 6 pies and 3 of them were blueberry pies. The experimental probability of an event is found by dividing the number of favorable outcomes by the total number of possible outcomes. In this case, the favorable outcome is selling a blueberry pie and the total number of possible outcomes is the total number of pies sold, which is 6. Therefore, the experimental probability of selling a blueberry pie is 3/6, which simplifies to 1/2.