# A random variable X has poisson distribution with mean 2. Then, P(X > 1.5) equal to

## Solution :

Now, P(X > 1.5) = P(2) + P(3) + …… $$\infty$$

= 1 – [P(0) + P(1)]

= 1 – $$(e^{-2} + {e^{-2}(2)\over 1})$$ = 1 – $$3\over e^2$$

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