Math CentralQuandaries & Queries


Question from Shawn, a parent:

For a normal distribution of u=654.00 and o=138.00.
What is the percentile rank for X=426?


You have the normal distribution with mean μ = 654.00 and standard deviation σ = 138.00. Convert to the standard normal distribution using

standard normal conversion

Use the value of Z obtained and your standard normal table to find

Pr(Z < Zo)

The percentile rank is this probability, expressed as a percentage.

I hope this helps,

About Math Central


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.
Quandaries & Queries page Home page University of Regina PIMS