Numeracy Foundation June 2022 Unit 1 Q9
9. Myra recorded the wingspan and mass of a number of birds.
Her results are shown in the scatter diagram below.

(a) The wingspan of one of the birds shown in the scatter diagram is 31 cm.
What is the mass of this bird? [1]
What is the mass of this bird? [1]
Mass is …………… g
(b) Two of the birds shown in the scatter diagram have a mass of 5 g.
What is the difference between the wingspans of these two birds? [2]
What is the difference between the wingspans of these two birds? [2]
Difference between the wingspans is …………… cm
(c) Use 30 cm ≈ 12 inches to answer this question.
Find the wingspan of the bird with a mass of 8·5 g.
Give your answer in inches. [3]
Wingspan is …………… inches
(d) What type of correlation does this scatter diagram show? [1]
(e) Use the scatter diagram to estimate the wingspan of a bird with a mass of 12 g. [1]
Wingspan is …………… cm
| Scheme | Marks | Comments |
|---|---|---|
| 18 (g) | B1 |
| Scheme | Marks | Comments |
|---|---|---|
| 15 – 12.5 or 5 × 0.5 2.5 (cm) | M1 A1 |
| Scheme | Marks | Comments |
|---|---|---|
| Sight of 20 (cm) | B1 | |
| (Wingspan in inches is) 12 × 20 ÷ 30 or 20 × 0.4 | M1 | Allow 20 ÷ 2.5 or equivalent |
| 8 (inches) | A1 | CAO |
| Scheme | Marks | Comments |
|---|---|---|
| Positive (correlation) | B1 | Do not accept a description |
| Scheme | Marks | Comments |
|---|---|---|
| An answer in the inclusive range 18.5 (cm) to 22.5 (cm) | B1 |