What requirements are necessary for a normal probability distribution to be a standard normal probability distribution? correct answer below The mean and standard deviation have the values ot mu = 0 and sigma = 1 The mean and standard deviation have the values of mu = 1 and sigma = 1 The mean and standard deviation have the values of mu = 1 and sigma = 0 The mean and standard deviation have the values of mu = 0 and sigma = 0