Find the expected value, the variance, and the X if OSX$2 standard deviation, when they exist, for the 12 probability density function. f(x)= 16 if x > 2 X What is the expected value? Select the correct choice below and, if necessary, fill in the answer box to complete your choice O A. The expected value is p (Round to two decimal places as needed.) O B. The expected value does not exist. What is the variance? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The variance is Var(X) ~ (Round to two decimal places as needed.) O B. The variance does not exist. What is the standard deviation? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The standard deviation is o (Round to two decimal places as needed.) O B. The standard deviation does not exist