HELP!! What is the area of this polygon?
2 answers:
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First, we are going to use the Pythagorean identity: 
to rewrite our expression. Solving for 
in our Pythagorean identity we get that 
, so we can rewrite our expression as follows:
Next, we are going to use the trig identity:
to completely simplify our expression:
We can conclude that
Next, we are going to use the trig identity:
We can conclude that
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.
