How to create Standard Deviation graphs in excel?

I'm trying to create standard deviation to see where values fall under 68% of the time. I can't figure it out...See the attached image for what it results in...

upload_2020-2-2_21-11-14.png


Edit:
Ok, I'm getting closer. Now..How do I make the bell curve nice, this is a semi-curve..
upload_2020-2-2_21-17-31.png
 
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