Let X have an exponential distribution with parameter λ. a. Determine E[X] and E[X^2] using partial integration.
Okay so I thought I could just plug that in my ti-89 or nspire cas cx, but neither can do it.
E[X] = $$\int_0^∞ xλe^{-λx} \,dx,$$ However that just gives me undef for both calculators. Wolfram alpha is happy to do it.
https://www.wolframalpha.com/input/?i=integral(xae%5E(-a*x))+from+0+to+infinity
Is there a way to do this on these calculators?