Assume that adults have IQ scores that are normally distributed with a mean of 104 and a standard deviation of 15.7. Find the probability that a randomly selected adult has an IQ greater than 127.5.   The probability that a randomly selected adult from this group has an IQ greater than 127.5 is _______.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.