In a data set containing n values, the 67th percentile can be found as follows: $$\mathrm { P } _ { 67 } = \frac { 67 } { 100 } \cdot \mathrm { n }$$

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The formula $\mathrm { P } _ { 67 } = \frac { 67 } { 100 } \cdot \mathrm { n }$ calculates the position of the 67th percentile in the data set, not the value of the 67th percentile itself. To find the value, you would then need to look at the data value in that position or interpolate between positions if the result is not an integer.

In a Data Set Containing N Values, the 67th Percentile P67=67100⋅n\mathrm { P } _ { 67 } = \frac { 67 } { 100 } \cdot \mathrm { n }P67​=10067​⋅n

In a Data Set Containing N Values, the 67th Percentile $\mathrm { P } _ { 67 } = \frac { 67 } { 100 } \cdot \mathrm { n }$