Marissa is researching information about martial arts students. She found that 7 out of 12 martial artists practice every day. There are 144 martial arts students at a school. a. Predict how many students practice every day. b. What is the sample size

a. 84 students are predicted to practice everyday.

b. The sample size is 12.

Step-by-step explanation:

Given:

Total number of martial arts students at the school is 144.

Now, to find the students predicted to practice everyday.

Let the number of students predicted to practice everyday be .

According to researching information 7 out of 12 martial artists practice every day.

So, 7 is equivalent to 12.

Thus, is equivalent to

Now, to solve by using cross multiplication method:

By cross multiplying we get:

Dividing both sides by 12 we get:

Hence, it is predicted that 84 students practice everyday.

Now, to get the sample size:

Sample size is the researching information to observe of numbers to include in a statistical sample.

So, here 12 is the sample size.

Thus, a. 84 students are predicted to practice everyday.

b. the sample size is 12.