Let be the radiation level to which a radiation worker is exposed during the course of

Let μ be the radiation level to which a radiation worker is exposed during the course of a year. The Environmental Protection Agency has set the maximum safe level of exposure at 5 rem per year. If a hypothesis test is to be performed to determine whether a workplace is safe, which is the most appropriate null hypothesis: H₀ :μ ≤ 5, H₀ :μ ≥ 5, or H₀ :μ = 5? Explain.