X obeys normal distribution, and the probability that the value of X is within (-3,-1) is equal to the probability that it is within (3,5), so what is the mathematical expectation of X)
According to the fact that the symmetry axis of the probability density function curve of normal distribution coincides with the mathematical expectation value of random variables,
Therefore, it can be determined by the following formula: p (-3
That is to say, the mathematical expectation of random variable x is:
E(X) = 1 .