Can you give the answer for all of this questions, Please?

Question 1 (3 Note: This question is different form Question 3, but you will likely find your answer to Question 3c helpful. The score of a student on a certain exam is represented by a number between 0 and 1. Suppose that the student passes the exam if this number is at least 0.55. Suppose we model this experiment by a A scientific lab is studying the lifetime of volatile molecules. Suppose they know that the lifetime (in hours) of the normal molecule is an exponentially distributed random variable with parameter ) = continuous random variable S, the score, whose probability density function is given by D.5. f(z) 4- 4x for 0