Try markov or if you rather call it chebyshev's .
Same idea with the second, just use the second moment and write X-2 for my X.
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.