Measures of central tendency

Worked examples (9)

• 1All three averages of a small data set
• 2The mean of an ungrouped frequency distribution
• 3Median and mode from an ungrouped frequency table
• 4Working backwards from a given mean
• 5Finding a missing frequency when the mean is given
• 6Estimating the mean of a grouped distribution, and the modal class
• 7Estimating the median by linear interpolation
• 8The specimen's four-mark interpolation
• 9An open-ended class: what survives and what does not

Model answers (9)

• ✓Model answer — 0479 specimen Paper 1 Q3(a) — 4.1
• ✓Model answer — 0479 Paper 1 style — 4.1
• ✓Model answer — 0479 Paper 2 style — 4.1
• ✓Model answer — 0479 specimen Paper 1 Q5(c) style — 4.1
• ✓Model answer — 0479 Paper 1 style — 4.1
• ✓Model answer — 0479 Paper 2 style — 4.1
• ✓Model answer — 0479 Paper 1 style — 4.2, 4.3
• ✓Model answer — 0479 specimen Paper 2 Q8(b) — 4.2
• ✓Model answer — 0479 specimen Paper 1 Q5(c), (d) — 4.1, 4.3

Worked examples (9)

• 1Qualitative data: only one average exists
• 2Which size should the shop stock?
• 3One advantage and one disadvantage of each measure
• 4Two averages, two arguments: the salary data
• 5What happens to each measure when a value is added
• 6An open-ended class removes a measure from the table
• 7Comparing two firms — but with which measure?
• 8Evaluating a misleading use of an average
• 9When the mean is not a preference but a requirement

Model answers (9)

• ✓Model answer — 0479 Paper 1 style — 4.4
• ✓Model answer — 0479 Paper 1 style — 4.4
• ✓Model answer — 0479 Paper 2 style — 4.4
• ✓Model answer — 0479 Paper 2 style — 4.4
• ✓Model answer — 0479 Paper 1 style — 4.4 (links to 6.3)
• ✓Model answer — 0479 specimen Paper 1 Q5 — 4.1, 4.4
• ✓Model answer — 0479 Paper 2 style — 4.4 (links to 6.6)
• ✓Model answer — 0479 Paper 1 style — 4.4 (AO2)
• ✓Model answer — 0479 Paper 2 style — 4.4 (links to 6.4)