Final answer:
Using the binomial probability formula with n=5 and p=0.2, the probability P(x=3) is calculated as 0.0512, correct to four decimal places.
Step-by-step explanation:
If n=5 and p=0.2, to find P(x=3), we can use the binomial probability formula:
P(x = k) = C(n, k) * p^k * (1-p)^(n-k)
Where:
- C(n, k) is the number of combinations of n things taken k at a time.
- p is the probability of success on a single trial.
- k is the number of successes for which we are finding the probability.
- n is the number of trials.
Let's calculate it:
C(5, 3) = 5! / (3!*(5-3)!) = 10
P(x = 3) = 10 * (0.2)^3 * (0.8)^(5-3) = 10 * 0.008 * 0.64 = 0.0512
Therefore, P(x=3) when n=5 and p=0.2 is 0.0512, accurate to four decimal places.