| Exam Board | OCR MEI |
|---|---|
| Module | S1 (Statistics 1) |
| Marks | 3 |
| Paper | Download PDF ↗ |
| Topic | Measures of Location and Spread |
| Type | Skewness identification and interpretation |
| Difficulty | Easy -1.2 This is a straightforward S1 question requiring basic data reading from a stem-and-leaf diagram to find mode and median (simple counting), then identifying positive skewness by inspection. All steps are routine recall with no problem-solving or calculation complexity beyond counting positions. |
| Spec | 2.02a Interpret single variable data: tables and diagrams2.02f Measures of average and spread |
| 8 | 3 | 9 | ||||||
| 9 | 3 | 5 | 6 | 6 | 6 | 8 | 9 | 9 |
| 10 | 0 | 2 | 2 | 3 | 4 | 6 | 9 | |
| 11 | 2 | 4 | 7 | 8 | ||||
| 12 | 3 | 4 | 5 | |||||
| 13 | 2 |
3 The stem and leaf diagram shows the weights, rounded to the nearest 10 grams, of 25 female iguanas.
\begin{center}
\begin{tabular}{ r | r r r r r r r r }
8 & 3 & 9 & & & & & & \\
9 & 3 & 5 & 6 & 6 & 6 & 8 & 9 & 9 \\
10 & 0 & 2 & 2 & 3 & 4 & 6 & 9 & \\
11 & 2 & 4 & 7 & 8 & & & & \\
12 & 3 & 4 & 5 & & & & & \\
13 & 2 & & & & & & & \\
\end{tabular}
\end{center}
Key: 11 | 2 represents 1120 grams\\
(i) Find the mode and the median of the data.\\
(ii) Identify the type of skewness of the distribution.
\hfill \mbox{\textit{OCR MEI S1 Q3 [3]}}