According to the text, the most common choice of limits for control charts is usually

Question $16$ options:

$\backslash$pm $2$ standard deviations.

$\backslash$pm $1$ standard deviations for means and $\backslash$pm $2$ standard deviations for ranges.

$\backslash$pm $3$ standard deviations.

$\backslash$pm $1$ standard deviation.

$\backslash$pm $3$ standard deviations for means and $\backslash$pm $2$ standard deviations for ranges.