A company wants to evaluate its attrition rate, in other words, how long new hires stay with the company. Over…

A company wants to evaluate its attrition rate, in other words, how long new hires stay with the company. Over the years, they have established the following probability distribution. Let X = the number of years a new hire will stay with the company. 
Let P(x) = the probability that a new hire will stay with the company x years.

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