Probability HW question

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Suppose someone receives 12 texts per hour.

What is the probability that this person received more than 4 texts in 10 minutes?

I'm clueless about how to start this. I know i have to use random variables and possibly cdf, but not how.

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$X\sim Po(\frac{12}{6})=X\sim Po(2)$
P$(X>4) =$ $1-$P$(X\leq4)=1-0.9473=0.0527$