Which of the following is not a characteristic of normal distribution?
1
The mean of the normal distribution may be negative or positive
2
For any normal random variable x, P(x ≤ μ) = P(x ≥ μ) = 0.50
3
For every pair of values μ and σ, the curve of the distribution is bell-shaped and symmetric
4
The kurtosis of the distribution is always less than 3