To predict how many students practice every day, we can use a proportion.
First, we need to find the proportion of martial artists who practice every day:
7/12 = 0.58
This means that 58% of martial artists practice every day.
To predict how many students practice every day out of the total 144 students, we can multiply the total by the proportion:
0.58 x 144 = 83.52
Rounded to the nearest whole number, we can predict that about 84 students practice every day.
The sample size is 144.