Final answer:
The rate of balls hit to times at bat is 3/10.
Step-by-step explanation:
The rate of balls hit to times at bat can be found by dividing the number of balls hit by the number of times at bat. In this case, the baseball player hit the ball 150 times out of 500 times at bat. Therefore, the rate is:
150/500
Which can be simplified to:
3/10