Answer
Sampling distribution is normal with mean = 266 and standard deviation = 3.58.
Work Step by Step
Here n = 20, hence:
$μ_{x̄} = μ = 266$
$σ_{x̄} = σ/\sqrt n = 16/\sqrt 20 = 3.58$
Sampling distribution is normal with mean = 266 and standard deviation = 3.58.
