Question

for making a scatter plot of the data set, which would be the best scale and interval for the axis that represents the amount of fluoride?

water (l)	4	2	6	8	6	2	10
fluoride (mg)	4.5	1.6	2.5	6.8	3.1	0.4	7.1

4 to 10 with intervals of 2
0 to 8 with intervals of 4
2 to 10 with intervals of 1
0 to 8 with intervals of 0.2

Explanation:

Step1: Find minimum and maximum of fluoride data

The minimum value of fluoride is $0.4$ mg and the maximum is $7.1$ mg.

Step2: Analyze each option

• Option 1: 4 to 10 with intervals of 2. The minimum value $0.4$ is not included, so it's not suitable.
• Option 2: 0 to 8 with intervals of 4. Intervals are too large to represent data accurately.
• Option 3: 2 to 10 with intervals of 1. The minimum value $0.4$ is not included.
• Option 4: 0 to 8 with intervals of 0.2. Covers the range from minimum ($0.4$) to maximum ($7.1$) and has a fine - enough interval for accurate representation.

Answer:

0 to 8 with intervals of 0.2