Sort the data from smallest to largest
Count the total number of values
Use the percentile position formula: P = (n + 1) × (percentile / 100)
If the position is a whole number, take the value at that position
If the position is a decimal, interpolate between the two nearest values
For grouped data, use the cumulative frequency table
Find the class containing the desired percentile
Apply the percentile formula for grouped data
Identify the percentile value from the resulting position
Verify the result is within the data range