Volume of 8.29ml and a mass of 16.31g

If you wanna know density then:

Density = mass/volume = 16.31/8.29 = 1.96 g/mL.

Hope this helps!

12.4%

Step-by-step explanation:

The results from the random sample counts 124 from a total of 1000 people that wear contact lenses. This means is the percentageof the people in the sample that wear contact lenses.Because it is a random sample, it is suppose to reflect the behavior of the total population. Then we can expect or predict  similar percentage of Americans wearing contact lenses (12.4%).