"The random variable X has a Poisson distribution with parameter λ = 3. By employing Markov’s inequality,

calculate bounds for P (X ≥ 7) in the cases where k = 1, 2. Which of the two estimates is better?"

What I've done:

P_X(k)=0.22404" alt="\ P_X(k)=0.22404" />

I'm not sure if thats right or have any idea which is a better estimate. Could someone help explain please? Thanks