Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities. (Round to the nearest thousandths.) P(1 x 18 = 12; = 4 A) B) C) D) E) 0.997 0.067 0.106 0.930 None of these The total area under a symmetric continuous probability distribution curve, to the right of the mean , is a) 1 b) 0 e) None of these c) .5000 d) .2500