Which are properties of a random variable? Select all that apply. SelThe table below shows a probability density function for a discrete random variable X , the number of technological devices per household in a small city. What is the probability that X is 0 , 2 , or 3 ? Provide the final answer as a fraction. x P(X = x) 0 3/20 1 1/20 2 1/4 3 3/10 4 1/5 5 1/20 ect The table below shows a probability density function for a discrete random variable X . What is the probability that X is 2 ? x P(X = x) 0 1/12 1 5/12 2 1/12 3 1/6 4 1/6 5 1/12 all that apply: Random variables are denoted with a lower case letter. Random variables are denoted with an upper case letter. Random variables are represented by numerical values. Random variables are not represented by numerical values. Discrete random variables do not have values that are countable