Daily fluid intake follows a distribution with μ = 2.5 L and σ = 0.6 L. A sample of n = 36 days is recorded.
What is approximately P(x̄ < 2.3)?
- A
0.3707
- B
0.0500
- Ccheck_circle
0.0228
- D
0.1587
Explanation
σ_x̄ = 0.6/√36 = 0.1. z = (2.3−2.5)/0.1 = −2. P(Z < −2) ≈ 0.0228.