Normal Distribution

[JDW]

I high school student posted a question under my YouTube video on the Prime yesterday, saying she is trying to find the best way to calculate "Normal Distribution." Today she said, "I found a slow but effective way to calculate normal distribution graphically, you can use NORMALD(mean, std deviation,x) in Function Symbolic View and use signed area for the upper and lower limits in plot mode. Also i read that you can use NORMAL_CDF(mean, std deviation, lower, upper) but this way is only effective symbolically."

What is the best way on the Prime to calculate Normal Distribution?