Surface-finish defects in a small electric appliance occur at random with a mean rate of 0.3 defects per unit. find the probability that a randomly selected unit will contain at least two surface-finish defect.

Probability that a randomly selected unit will contain at least two surface- finish defect is 0.04.

Step-by-step explanation:

Since we have given that

Mean rate defects per unit = 0.3

Since we will use "Poisson distribution":

But we need to find the probability that a randomly selected unit will contain at least two surface-finish defect.

So,

so, it becomes,

Hence, probability that a randomly selected unit will contain at least two surface- finish defect is 0.04.

just take the area of the square and then the area of the circle then subtract the circle area from the squares area

step-by-step explanation: