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)

hey there!

if she's saving for six months, let's divide the total number we need for the trip by six, dividing it into the amount that needs to be saved for each month.

500 ÷ 6 =

she needs to save at least this amount each month, so we should use this symbol: ≥

let x be the amount she saves each month.

your final answer is x ≥

hope this !