Let X represent the time it takes from when someone enters the line for a roller coaster until they exit on the other side. Consider the probability model dened by the cumulative distribution function given below. 0 X 4.17 a) What is E(X)? Give your answer to three decimal places. |:| b) What is the value c such that P(X g c) : 0.55? Give your answer to three decimal places. Hint: F{c) : P(X g c) E