An environmental scientist investigated air quality in an urban area. She selected a sample of 10 representative monitoring stations. At each station, she recorded the concentration of fine particulate matter ( $PM_{2.5}$ , measured in $μg/m3\mu\text{g/m}^3$ ) under two different atmospheric conditions: Day A (stagnant air, high pressure) and Day B (windy, low pressure).

Table 2: $PM_{2.5}$ concentration ( $μg/m3\mu\text{g/m}^3$ ) at 10 monitoring stations on Day A and Day B

Monitoring Station	Day A (Stagnant Air)	Day B (Windy)
1	44	22
2	48	26
3	38	18
4	52	29
5	41	20
6	36	19
7	50	28
8	34	15
9	45	24
10	40	21

Explain one reason why the mean would be the most appropriate measure of central tendency to summarise the data in Table 2.

Table 2: $PM_{2.5}$ concentration ( $μg/m3\mu\text{g/m}^3$ ) at 10 monitoring stations on Day A and Day B

Monitoring Station	Day A (Stagnant Air)	Day B (Windy)
1	44	22
2	48	26
3	38	18
4	52	29
5	41	20
6	36	19
7	50	28
8	34	15
9	45	24
10	40	21

Explain one reason why the mean would be the most appropriate measure of central tendency to summarise the data in Table 2.

Data handling and analysis

Question 23

Markscheme

Data handling and analysis

Question 23

Markscheme

Data handling and analysis

Question 23

Data handling and analysis Questions

Data handling and analysis

Question 23

Data handling and analysis Questions