There is one error in one of five blocks of a program. to find the error, we test three randomly selected blocks. let x be the number of errors in these three blocks. compute e(x) and var(x)

Answer with explanation:

Number of Blocks in the program =5

Number of errors in the Program =1

Probability of an event

Probability of getting an error in a program out of five programs

Now, three programs are selected randomly

Required probability that is Expectation E(x)

        =1 ×Error in first one and No error in last two +2×Error in Second one and No error in first and last +3×Error in Third one and No error first and Second one

→E(x²)

Variance (x)

      =E(x²)-E(x)

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