Question #229745

4. Show that the normal density with parameters ยต ๐‘Ž๐‘›๐‘‘ ๐œŽ has inflection points at the values ยต โˆ’ ๐œŽ ๐‘Ž๐‘›๐‘‘ ยต + ๐œŽ. (Recall that an inflection point is a point where the curve changes direction from concave up to concave down, or vice versa, and occurs when the second derivative changes sign. Such a change in sign may occur when the second derivative equals zero.)

5. Assume that ๐‘Œ has a normal distribution with a mean and a standard deviation. A mathematician creates a rectangle with length ๐ฟ = |๐‘Œ | and width ๐‘Š = 3|๐‘Œ | after seeing a value of ๐‘Œ. Allow A to represent the area of the resultant rectangle. What exactly is ๐ธ(๐ด)? 


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