A scientist wants to find the average weight of fish living in a large pond. So she will use the weights of 30 fish from the pond to find the average weight. Answer the questions below. (a) Which unit(s) could be used for the unit of measurement? Check all that apply. seconds ounces hours Opounds minutes (b) Which of the procedures below would be the best way to find the average weight? O Pick 30 fish from a shallow region of the pond and estimate their weights. O Pick 30 fish from a shallow region of the pond and weigh each of them. O Randomly pick 30 fish from the entire pond and weigh each of them. O Randomly pick 30 fish from the entire pond and estimate their weights.