Unit 2
4 marks · EasyThe heights (in metres) of four plants are shown below:
| Plant | Height (m) |
|---|---|
| A | 1.32 |
| B | 1.18 |
| C | 1.40 |
| D | 1.26 |
A fifth plant is measured at 1.34 m. The total height of all five plants is recorded. The mean height is also calculated.
Work out the total height of all five plants.
Calculate the mean height of the five plants. Give your answer to 2 decimal places.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) 6.50 m
(b) 1.30 m
Common mistakes: Arithmetic errors in decimal addition; Incorrect division for mean
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Adds all five heights together (correct method).
A1 (a) · 1 mark · Correct total: 6.50 m.
M2 (b) · 1 mark · Divides total height by 5 for the mean. (follow-through)
A2 (b) · 1 mark · Gives answer to 2 decimal places: 1.30 m. (follow-through)
Worked solution
(a) Total height = 1.32 + 1.18 + 1.40 + 1.26 + 1.34 = 6.50 m
(b) Mean height = m (to 2 decimal places)