Question: In alpha testing a new software package, a software engineer finds that the number of defects per 100 lines of code is a random variable

In alpha testing a new software package, a software engineer finds that the number of defects per 100 lines of code is a random variable X with probability distribution:

Find
(a) Pr(X > 1).
(b) Pr(X = 3|X > 2).
(c) E(X)
(d) Var(X).

Pr(X=x)| 0.4 0.3 0.2 0.1

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