42 a M1 2 M1 for correct example (class widths do not need to be H e.g. 0 <5; 5 < 25; 25 < 32 x x x ≤ ≤ ≤ 3 equal) Estimated range (from mid-points) = 28.5–2.5 b e.g. M1 M1 for correct example (class widths do not need to be equal) n = 11 hence 6th data point is the median Estimated median (from mid-point) = 46 e.g. c M1 M1 for correct example of estimated median M1 M1 for correct example of estimated range(class widths do not need to be equal) = 11 hence 6th data point is the median n Estimated median (from mid-point) = 22.5 Estimated range (from mid-points) = 72–10 = 62 d e.g. M1 M1 for correct division: (sum of frequencies × M1 ÷ (total frequency) M1 for correct example of estimated mean (ft) (class widths do not need to be equal) Estimated mean = 1296 ÷ 36 = 36 (to one decimal place) 6
42 a b c d e.g. 0 ≤ x <5; 5 ≤ x < 25; 25 ≤ x < 32 Estimated range (from mid-points) = 28.5–2.5 e.g. n = 11 hence 6th data point is the median Estimated median (from mid-point) = 46 e.g. n = 11 hence 6th data point is the median Estimated median (from mid-point) = 22.5 Estimated range (from mid-points) = 72–10 = 62 e.g. Estimated mean = 1296 ÷ 36 = 36 (to one decimal place) M1 M1 M1 M1 M1 M1 2 3 M1 for correct example (class widths do not need to be equal) M1 for correct example (class widths do not need to be equal) M1 for correct example of estimated median M1 for correct example of estimated range(class widths do not need to be equal) M1 for correct division: (sum of frequencies × ÷ (total frequency) M1 for correct example of estimated mean (ft) (class widths do not need to be equal) H 6
Foundation_Skills_Statistics%20MarkScheme_Edexcel.docx