The back-to-back stem-and-leaf diagram shows the diameters, in cm, of 19 cylindrical pipes produced by each of two companies, A and B.
Company A | Company B
----------|-----------
4 | 33 | 1 2 8
9 8 3 2 0 | 34 | 1 6 8 9 9
8 7 5 4 1 1 | 35 | 1 2 2 3
9 6 5 2 | 36 | 5 6
4 3 1 | 37 | 0 3 4
| 38 | 2 8
Key: 1|35|3 means the pipe diameter from company A is 0.351 cm and from company B is 0.353 cm.

Q: What topic does this question test?

This question tests Probability and statistics in A-Level Mathematics (syllabus code 9709). It is worth 7 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Mathematics May/June 2022 examination, Paper 5 Variant 2 (9709_s22_qp_52.pdf).

Question

The back-to-back stem-and-leaf diagram shows the diameters, in cm, of 19 cylindrical pipes produced by each of two companies, A and B.
Company A | Company B
----------|-----------
          4 | 33 | 1 2 8
9 8 3 2 0 | 34 | 1 6 8 9 9
8 7 5 4 1 1 | 35 | 1 2 2 3
        9 6 5 2 | 36 | 5 6
          4 3 1 | 37 | 0 3 4
                | 38 | 2 8
Key: 1|35|3 means the pipe diameter from company A is 0.351 cm and from company B is 0.353 cm.

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