The weights of certain hardcover books on a small shelf are normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.

So my answer looks like this:

z= x-u/σ

1.645 = x -9.75 -.08

1.645*.08 + 9.75 = 9.8816

Is this the answer? I have this class online and its hard to reach the teacher sometimes. I have a feeling this problem is incomplete. Can anyone enlighten me?