Cholesterol level has μ = 200 mg/dL, σ = 30. n = 25 people sampled.
Approximately, what is P(195 < x̄ < 210)?
- Acheck_circle
≈ 0.7501
- B
≈ 0.3413
- C
≈ 0.5000
- D
≈ 0.9544
Explanation
σ_x̄ = 30/√25 = 6. z₁ = (195−200)/6 ≈ −0.83; z₂ = (210−200)/6 ≈ 1.67. P ≈ 0.9525 − 0.2033 ≈ 0.749.