The annual-maximum 24-h rainfall amounts on a tropic island have a mean of 320 mm and a standard deviation of 156 mm. the idf curve for the 50-year storm on the island is given by 0.65 6240 ( 6.87) i t   where i is the rainfall intensity in mm/h, and t is rainfall duration in minutes. assume the annualmaximum 24-h rainfall amounts follows the generalized extreme value (gev) distribution. calculate the frequency factor, km, for a return period of 75,000 years

Uestion 1(multiple choice worth 5 points) (05.02)alex wants to paint one side of his skateboard ramp with glow-in-the-dark paint, but he needs to know how much area he is painting. calculate the area of the isosceles trapezoid. isosceles trapezoid with top base 12 feet, bottom base of 18 feet, and height of 6 feet. 72 ft2 84 ft2 90 ft2 108 ft2

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)