Mr. Squirrel Nuts Company has a very popular product called Nuts-Delight, which is a variety of nuts in a 1 lb bag. The nuts are packaged using automated machines. The company takes random samples for quality control. The samples are then carefully weighted to make sure that they are close to 1 lb as labelled. In the past 25 days, the quality control team has taken 63 bags of Nuts-Delight everyday from the production line. And the weights are double-checked and recorded. What is the sample size used by the quality control team?