A population has μ = 500 and σ = 100. Samples of size n = 25 are taken.
Find the value of x̄ that corresponds to the 90th percentile.
- A
≈ 628
- Bcheck_circle
≈ 525.6
- C
≈ 510
- D
≈ 600
Explanation
σ_x̄ = 100/√25 = 20. z₀.₉₀ ≈ 1.28. x̄ = 500 + 1.28(20) = 525.6.