Show that the normal density with parameters and has inflection points at the values and
Chapter 4, Problem 4.79(choose chapter or problem)
Show that the normal density with parameters and has inflection points at the values and + . (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.)
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