Answer
$μ_{x̄} = 52$
$σ_{x̄} = 2.182$
Work Step by Step
We have μ = 52, σ = 10 and n= 21
$μ_{x̄} = μ$, hence $μ_{x̄} = 52$
$σ_{x̄} = σ / \sqrt n$
$= 10 / \sqrt 21$
= 2.182
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