The total area under the normal curve is equal to 1 2. the distribution is mounded and symmetric; it extends indefinitely in both directions, approaching but never touching the horizontal axis 3. the distribution has a mean of 0 and a standard distribution of 1 4. the mean divides the area in half, .50 on each side 5.he total area under the normal curve is equal to 1 2. the distribution is mounded and symmetric; it extends indefinitely in both directions, approaching but never touching the horizontal axis 3. the distribution has a mean of 0 and a standard distribution of 1 4. the mean divides the area in half, .50 on each side 5.