1. The total area under the normal curve is equal to 0.5. true or false? 2.The normal distribution is symmetrical about the mean. true or false? 3. The three measures of central tendency, which are the mean, median and the mode, are unequal and are located at the axis of symmetry. true or false? 4.The tails of a normal curve are asymptotic relative to the horizontal line. true or false? 5.What do you call the rectangular bars that graphically present the frequency distribution of each class