Work Step by Step
We use the standard equation for average, where x is the unknown value. $(100+121+105+113+108+x)/6 = 112 \\ (100+121+105+113+108+x) = 672 \\ x = 125$
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.