I can see two different ways to place the parentheses in that question.
Here are both answers:
( e-2 ) x infinity = infinity
( e-2 x infinity ) = zero
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E to the power infinity, or lim en as n approaches infinity is infinity.
that would be the inverse of e to the plus infinity Answer is thus zero
Trans infinity
This browser is not much use when it comes to mathematics but I'll try.Suppose X is a random variable with a Normal distribution and let f(x) be the probability density function of x.Then the mean is mu = E(X) = Integral of x*f(x) dx over the domain of X [which is negative infinity to positive infinity].The variance is E{[X - E(X)]2} = Integral of (x - mu)2*f(x) dx over the domain of X.
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