Thread: two easy questions I can't figure out

1. Let X be a random variable such that . Show that

2. Let X have mean 2 and variance 0. Show that .

They're both pretty simple and intuitively obvious, but with no other description of the random variable I really have no idea what properties to even work with.

Try markov or if you rather call it chebyshev's .

For all

.

Same idea with the second, just use the second moment and write X-2 for my X.