IBHardStatistics7–9
One class of 18 pupils has a mean test score of 62 and another class of 12 pupils has a mean of 72. What is the mean score of all 30 pupils?
Uma turma de 18 alunos tem média 62 num teste e outra turma de 12 alunos tem média 72. Qual é a média dos 30 alunos?
Answer options
Solution
Step 1 of 3
- 1.Total score = 18 \times 62 + 12 \times 72 = 1116 + 864 = 1980