I am trying to compute the 98 percentile value of a normal distribution data set. The data is from this website https://www.cdc.gov/growthcharts/percentile_data_files.htm, file No.8 called "BMIAGE". It's the childhood BMI reference table from CDC.
As you can see, the table has L,M,S,P3,P5,P10,P25,P50,P75,P85,P90,P95,P97 values, and my question is how to use this table to compute 98 percentile value for each age (each row)? Thanks!