Final answer:
To find the probability for trial 9 in a binomial experiment with 12 trials, use the binomial probability formula.
Step-by-step explanation:
In a binomial experiment with 12 trials, the probability of a success remains constant for each trial. In this case, the probability of trial 5 is given as 0.66. To find the probability for trial 9, we can use the binomial probability formula.
The binomial probability formula is: P(X=k) = C(n,k) * p^k * q^(n-k), where P(X=k) is the probability of getting exactly k successes, n is the number of trials, p is the probability of success on each trial, q is the probability of failure on each trial, and C(n,k) is the binomial coefficient.
Using this formula, we can plug in the values from the question. Since we want to find the probability for trial 9, k=9, n=12, p=0.66, and q=1-p. By calculating this, we can find the probability for trial 9.