How do you want this to be solved ?
It will be 3n x 3n x 3n
hope this helps
No association would be the answer.
You want to find the value of x for which the area under the curve to the left of x is 0.6. One way to do that is to create the cumulative distribution function (CDF) for the given PDF, then see where it is equal to 0.6.
Doing that, we find a = 5.