HP 39g Graphing Calculator - Manual (Page 107)

Computed statistics
One-variable
Statistic Definition
NS Number of data points.
TOTS Sum of data values (with their
frequencies).
MEANS Mean value of data set.
PVARS Population variance of data set.
SVARS Sample variance of data set.
PSDEV Population standard deviation of data
set.
SSDEV Sample standard deviation of data set.
MINS Minimum data value in data set.
Ql First quartile: median of ordinals to
left of median.
MEDIAN Median value of data set.
Q3 Third quartile: median of ordinals to
right of median.
MAXS Maximum data value in data set.
When the data set contains an odd number of values, the data
set’s median value is not used when calculating
Q1 and Q3 in
the table above. For example, for the following data set:
{3,5,7,8,15,16,17}
only the first three items, 3,5, and 7 are used to calculate Ql,
and only the last three terms, 15, 16, and 17 are used to
calculate Q3.
Statistics aplet 8-13