Answer:
0.488
Step-by-step explanation:
Use binomial probability:
P = nCr pʳ qⁿ⁻ʳ
where n is the number of trials,
r is the number of successes,
p is the probability of success,
and q is the probability of failure (1−p).
Here, n = 3 and p = 0.2.
The complement of at least 1 is at most 0.
P(r ≥ 1) = 1 − P(r = 0)
P(r ≥ 1) = 1 − ₃C₀ (0.2)⁰ (0.8)³⁻⁰
P(r ≥ 1) = 1 − (0.8)³
P(r ≥ 1) = 0.488
