Reads out the math statistics values.
The statistics function is applied either over the whole range, or
within the range specified by CALC:MST:DOM command (the range
limits are determined by two markers).
The data include 3 elements:
<numeric 1> Mean value;
<numeric 2> Standard deviation;
<numeric 3> Peak–to–peak (difference between the
maximum value and the minimum value).
(query only)