2part question a. predict b what sample size show work

a. 84 students

b. 12

Step-by-step explanation:

a.

From the information given, we see that 7 out of 12 practice every day. Now we want to know how many (let it equal x) would we expect to practice everyday given there are total 144 martial artists?

we set up a ratio and cross multiply and solve for x:

So 84 students practice everyday

b.

The sample size is a "proportion" of the whole population. Here, there are a total of 144 martial artists. And we took 12 of them to figure out how many practice everyday (from these 12). So , clearly, the sample size is 12