Alia works for a website that helps customers see how much different cars may cost. She wants to estimate the average selling price for a particular car, so she takes a random sample of selling prices for that car (more than of these cars have been sold). The data are roughly symmetric with a sample mean selling price of . There are some outliers in each direction. She's considering using her data to make a confidence interval for the mean selling price of this car. Which conditions for constructing a interval have been met?