simple chi-squared problem

[messianic]

This is probably a very simple problem

Y is distributed by the chi-squared distribution with 5 degrees of freedom. Calculate the probability that Y>9.24.

I know this means that Y is the sum of 5 squared standard normal distributed variables. I can calculate the probability for any individual standard normal variable. Not sure what to do

[Dragan]

This is probably a very simple problem

Y is distributed by the chi-squared distribution with 5 degrees of freedom. Calculate the probability that Y>9.24.

I know this means that Y is the sum of 5 squared standard normal distributed variables. I can calculate the probability for any individual standard normal variable. Not sure what to do

The easiest approach is to use software that has the chi-square probability distribution e.g. Excel, Minitab, etc.

I use Minitab, so Pr{Y>9.24} = 0.10.

[Dason]

Yeah, using the definition of "sum of 5 independent squared normals" won't help you much unless you try to get the probability by simulation. Most likely you just need to look it up in a table or use software to get the answer.