Math Help - probability

1. probability

The time taken by a randomly selected applicant for a mortgage to fill out a certain form has a normal distribution with mean value $10$ min and a standard deviation $2$ min. If five individuals fill out a form on one day and six on another, what is the probability that the sample average amount of time taken on each day is at most $11$ minutes?

So is this just $P \left(z \leq \frac{1}{2/\sqrt{5}} \right) = \Phi(1.118) = 0.8686$ and $P \left(z \leq \frac{1}{2/\sqrt{6}} \right) = \Phi(0.816) = 0.7939$?

2. I get 0.8682 for the first one.

On the second you have the wrong value for $\frac{\sqrt{6}}{2}$