The mean is 28.5.
Work Step by Step
Find the mean by totaling all the values and dividing by the total number of values. $(18+12+15+24+9+42+54+87+21+3)\div10\longrightarrow$ Sum all the values. =$285\div10$ =$28.5$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.