It's a little bit counterintuitive that a defective chip would be a success, but we're summing up the defective chips. So we would view the probability of a defect, or I should say a defective chip, it is constant across these 500 trials, and we will assume that they are independent of each other, 0.02. You might be saying, hey, well, are we replacing the chips before or after? But we're assuming it's from a functionally infinite population, or if you wanna make it feel better, you could say, well, maybe you are replacing the chips. They're not really telling us that right over here. So we'll assume that each of these trials are independent of each other, and that the probability of getting a defective chip stays constant here. And so this is a binomial random variable, or binomial variable, and we know the formulas for the mean and standard deviation of a binomial variable.