Forumula for Excel Bell Curve and Histogram

Yes, I did, but I'm not able to get the bell curve result using that formula, as I'm using the secondary axis for the curve. What I need is a formula, so that the secondary axis can show the bell curve.

The problem is that what I have is a consolidated data, e.g. 0-30 is 98 frequency, 31-40 is 54 frequency, etc, so if I were to use NormDist function, I will need to manually break them down into raw data, which is extremely tedious.