2.3 Measures of the Location of the Data
where i = the ranking or position of a data value,
k = the kth percentile,
n = total number of data.
Expression for finding the percentile of a data value: (100)
where x = the number of values counting from the bottom of the data list up to but not including the data value for which you want to find the percentile,
y = the number of data values equal to the data value for which you want to find the percentile,
n = total number of data
2.5 Measures of the Center of the Data
Where f = interval frequencies and m = interval midpoints.
2.7 Measures of the Spread of the Data