2 brownies where shared by 3 friends, how much do they get

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?