Answer
$μ_{x̄} = 50$
$σ_{x̄} = 0.632$
Work Step by Step
We have n= 40, μ = 50 and σ = 4
$μ_{x̄} = μ$, hence $μ_{x̄} = 50$
$σ_{x̄} = σ / \sqrt n$
$= 4 / \sqrt 40$
= 0.632
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