4 of 20 P(X = x) means the probability that the random variable X is equal to the specific value x. O True False 5 of 20 The areas above and below the mean of a normal curve are identical because the normal curve is symmetrical about its mean the total area is equal to 1 the data is evenly balanced this corrects for skewness 6 of 20 According to the empirical rule, if a population is normally distributed what percentage of values lie within two standard deviations of the mean? 50% 68% 95% 99.7% 7 of 20 According to the empirical rule, if a population is normally distributed what percentage of values lie between the mean and one standard deviation above the mean? 25% 34% 47.5% 68%