Question

the dot plot shows the number of hours, to the nearest hour, that a sample of 5th - and 7th - grade students spend watching television each week. how do the medians compare? the 5th - grade range is the 7th - grade range is the ratio of variation of 5th grade to 7th grade is

Explanation:

Step1: Find 5th - grade range

Count the number of dots for 5th - grade. The lowest value is 1 and the highest is 9. Range = highest - lowest. So, range = 9 - 1=8.

Step2: Find 7th - grade range

Count the number of dots for 7th - grade. The lowest value is 1 and the highest is 8. Range = highest - lowest. So, range = 8 - 1 = 7.

Step3: Find the ratio of variation

The ratio of the 5th - grade range to the 7th - grade range is $\frac{8}{7}\approx1.14$.

Answer:

The 5th - grade range is 8.
The 7th - grade range is 7.
The ratio of variation of 5th grade to 7th grade is $\frac{8}{7}$.