1.The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set. The median is the middle value when a data set is ordered from least to greatest. The mode is the number that occurs most often in a data set. 2. The mean is the average of a data set. The mode is the most common number in a data set. The median is the middle of the set of numbers. 3. I don’t know the last one sorry lol