13. (8 points) The graph of the derivative, f'(x), of a function f() is shown. (a) (2 points) On what intervals is f(x) increasing or decreasing?
(b) (2 points) At what values of x does f(2) have local maximum or minimum?
(c) (2 points) In what interval is f(x) concave upward or downward?
(d) (2 points) What are the x-coordinates of the inflection points of f(x)?

The annual snowfall in a town has a mean of 38 inches and a standard deviation of 10 inches. last year there were 63 inches of snow. find the number of standard deviations from the mean that is, rounded to two decimal places. 0.44 standard deviations below the mean 2.50 standard deviations below the mean 0.44 standard deviations above the mean 2.50 standard deviations above the mean