Exercise 1: Random Variables (i) Decide whether the following are discrete or con- tinuous random variables and for each describe the sample space. (a) Ten laser diodes are randomly selected from the production line and the number of those with efficiency above 3mW per mA at 250C is recorded. (b) When a student calls a university help desk for technical support, he/she will either immedi ately be able to speak to someone (S, for success) or will be placed on hold (F, for failure). (c) The temperature of a randomly selected point in space. (d) The sum of numbers in an experiment of roiling two die separately (or one die twice). If discrete find the probability mass function. (e) Find cumulative distribution function for the random variable in (d)