12(a)Measures Location SpreadMedium3 marksThese are four values.200512nn+1The mean of the four values is 3n.Find the value of n.WorkingTypeWriteMath0 wordsn=Grade answerSolutionGrading criteria
12(b)Measures Location SpreadMedium4 marksThe table shows some information about the mass of each of 200 boxes.mass (m grams)0<m≤2020<m≤4040<m≤6060<m≤80frequency29675549Calculate an estimate of the mean.WorkingTypeWriteMath0 wordsgGrade answerSolutionGrading criteria