Which of the following is not true about the standard normal distribution?     The total area under the standard normal curve is 1.     The area under the standard normal curve to the left of z = 0 is negative.     The standard normal curve is symmetric about z = 0.     The area under the standard normal curve between z = -1 and z = 1 is 0.6826.

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.