Let X be a random variable with the following probability distribution. Complete the following. (If necessary, consult a list of formulas.) (a) Find the expectation E(X) of X. E(X)= (b) Find the variance Var(X) of X. Var(X)= Acohol withidrawal occurs when a persion who uses alcohol excessively sudden'y stops the alcohol use, Studies have shown that the onset of withdrawal is experienced a mean of 39.5 waurs after the lact dink, with in standard deviation of i7 hours. A sample of 35 people who use alcohel excessively is to be tiken. Whak is the probabilty that the sample mean time brtween the last drink and the onset of withdrawar will be 4 i. 5 hours ar less? Carry your intermediate computatibns to in least four decimal places. found youl answe ta at least three docimal placis