Question: 5. When we play fetch with Bella (that is, throw the ball for her), though she always runs after it, she may or may not

5. When we play fetch with Bella (that is, throw the ball for her), though she always runs after it, she may or may not bring the ball back. Suppose that every time she goes after the ball, there is a 2 3 chance that she will bring the ball back, independently of all other times. One day, while playing with her, suppose that I have thrown the ball 15 times. If she brought the ball back 9 times out of the 15 times I had thrown it, what is the chance that she brought the ball back exactly 4 times in the first 7 throws? (7 points)

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