# Question 1:

## Part (i)
| Answer | Marks | Guidance |
|--------|-------|----------|
| Median $= 7.45$ (m) | B1 | cao |
| $IQR = 7.75 - 6.7$ or $77.5 - 67$ or $77.75 - 66$ or $7.8 - 6.5$ or $78 - 65$ | M1 | These pairs of values only, and subtract |
| $= 1.05$ (m); allow 1.175 or 1.18, NOT 1.3 | A1 | allow 10.5 or 11.75 or 11.8 but only if med $= 74.5$ |

## Part (ii)
| Answer | Marks | Guidance |
|--------|-------|----------|
| Correct digits in correct leaves, ignore order, allow one omitted or extra or misplaced or incorrect digit | B1* | Key: e.g. $8\|6\|4$ means 6.8 (B) and 6.4 (A); allow just $8\|6$ means 6.8; NOT $8\|6$ means 8.6 |
| Complete correct diagram including order and key and alignment | B1dep | Allow $8\|6$ means 68, if consistent with (i); If all digits in correct rows and orders, & correct key, award this mark unless EITHER: a $2^{nd}$ digit in one row clearly aligned with a $3^{rd}$ digit in another OR 1st, 3rd, 4th & 5th rows are very different lengths |

## Part (iii)
| Answer | Marks | Guidance |
|--------|-------|----------|
| One correct comment on size | B1 | A higher overall / A has more taller trees or fewer shorter / A has higher median. NOT "A higher than B". Allow just quoting two medians even if wrong |
| One correct comment on spread or shape | B1 | B more evenly spread or distributed / B has larger range or IQR. NOT any reference to outliers, sample size, individual trees, two comments on size, two comments on spread |

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