A company that makes hair-care products had 3,000 people try a new shampoo. Of the 3,000 people, 21 had a mild allergic reaction. What percent of the people had a mild allergic reaction?

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

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?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?