A population of values has a normal distribution with $\displaystyle \mu={231.9}$ and $\displaystyle \sigma={28.1}$. You intend to draw a random sample of size $\displaystyle {n}={142}$.

What is the mean of the distribution of sample means?
$\displaystyle \mu_{{\overline{{x}}}}=$

What is the standard deviation of the distribution of sample means?
$\displaystyle \sigma_{{\overline{{x}}}}=$ Round to 4 decimal places.