I have a table here that I don't quite understand

x 0 1 2 3 4 5

P (x) 0.237 0.396 0.264 0.088 0.015 0.001

x = # of prisons out of 5 on parole who become repeat offenders.

What is P (x) ? and why does it add up to 1?

Mai 60 meters of 35%.

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