Which statement is true?

Question

1. The total area under the curve is equal to twice the mean
2. The mean of a normal distribution divides the area into 3 equal parts
3. The mean of a standard normal distribution is 1
4. A normal curve has a vertical line of symmetry at the mean

Answer 1

3 and 4 - The mean of a standard normal distribution is one. There is a vertical line of symmetry of a standard normal curve at the mean. The mean of a standard normal curve is a bell symmetrical about the y axis.