4. Show that the normal density with parameters ยต ๐๐๐ ๐ has inflection points at the values ยต โ ๐ ๐๐๐ ยต + ๐. (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 has a normal distribution with a mean and a standard deviation. A mathematician creates a rectangle with length ๐ฟ = |๐ | and width ๐ = 3|๐ | after seeing a value of ๐. Allow A to represent the area of the resultant rectangle. What exactly is ๐ธ(๐ด)?
Comments