The weight of a candy bar has μ = 50 g and σ = 2 g. A sample of n = 16 bars is selected.
Approximately, what is P(49.5 < x̄ < 50.5)?
- A
0.5000
- Bcheck_circle
0.6826
- C
0.9544
- D
0.3173
Explanation
σ_x̄ = 2/√16 = 0.5. z = ±1. P(−1 < Z < 1) ≈ 0.6826.
Sampling Distributions for Sample Means
AP Statistics· difficulty 3/5
Want 10 more like this — adaptive to your weak spots?