Question 747511
I get a slightly different answer for #2. The math for the z-scores is correct, but the area under them is not.

For it to be 99.7, the z-scores would have to be -3 and 3, encompassing the entire area under the bell curve (using the empirical values). 
If we draw out the bell curve, we see that the first point is in the middle(the given mean).
So, the actual area under these 2 points is 49.85%.
We can achieve this 2 ways:
1. Simply divide 99.7/2 or
2. take 68/2=34 (representing 1 std dev to the right of the mean), add 13.5 (which is 95-68/2: representing 2 std dev to the right of the mean), and add 2.35 ( which is 99.7-95/2 representing 3 std dev to the right of the mean.

Point out where I'm wrong if I am, but after actually drawing the bell curve, it becomes very obvious the area under the points is approximately 50%. No worries, I make mistakes all the time :).
That said, your question was helping with the formula, which the original person answering got 100% correct: Z=(value-mean)/std dev

Good luck and hope this helps,
Mike