A population has mean $64$ and standard deviation $6.$

Part: $\frac{0}{2}$

Part $1$ of $2$

$($a$)$ What value is $2\mathrm{.}5$ standard deviations below the mean?

The value that is $2\mathrm{.}5$ standard deviations below the mean is

Part: $1/2$

Part $2$ of $2$

$($b$)$ What values are $1$ standard deviations from the mean?

The values that are $1$ standard deviations from the mean are and