Answer:
D. The distance from the mean to an inflection point
Step-by-step explanation:
We rarely encounter the actual formula for the normal PDF. It is ...

In fact, the inflection points are at x = ±1, where the curve changes from being concave downward to concave upward.
So, one standard deviation is the distance from the mean to an inflection point.
Answer:
12=obtuse
13=right
14=not a triangle
16=acute
Step-by-step explanation:
Answer: 0.04219409282
Step-by-step explanation: