(1 point) The continuous random variable, X, has the probablity density function given below. 0.312x + b for3 5 x 5 5.5 0 elsewhere f(x) = { What must b be in the probability density function? I) = (1 point) The probability density function for continuous random variable, X, is unknown, but the following probables are known. P(x > 63) = 0.186 P(x > 49.7) = 0.373 P(x