The partially completed box plot shows the distribution of average temperatures at Heathrow in 2015.

An outlier is defined as a value more than 1.5×IQR1.5 \times \text{IQR}1.5×IQR below Q1 Q_1\,Q1 or more than 1.5×IQR1.5 \times \text{IQR}1.5×IQR above Q3Q_3Q3. The lowest temperature was 8∘C8^\circ\text{C}8∘C and the highest two temperatures were 23∘C23^\circ\text{C}23∘C and 28.7∘C28.7^\circ\text{C}28.7∘C.
Complete the box plot showing clearly any outliers.
121 exam-style questions on OCR A Level Maths 2.2 Data Presentation and Interpretation, covering 2.2.1 Tables and diagrams for single variable data, 2.2.2 Area in a histogram, 2.2.3 Scatter diagrams and regression lines, 2.2.4 Informal interpretation of correlation, 2.2.5 Correlation and causation, 2.2.6 Measures of average and spread, 2.2.7 Calculations of mean and standard deviation, 2.2.8 Outliers, 2.2.9 Selecting or critiquing data presentation, and 2.2.10 Cleaning data. Each one has a worked solution and a mark scheme showing where the marks go.