Question

a survey of students attending Middle school North revealed that 18 of 24 students have many students do not have a touch screen phone?

Answer 1

Question:

Solution:

Step 1: Calculate the number of students that touch screen phone in a sample of 816 students:

Let's denote by x the number of students that touch screen phone and consider the following diagram :

By cross-multiplication, solve for x:

$x\text{ = }\frac{(816)(18)}{24}=612$

Step 2: Subtract the obtained value of step 1 to 816

$816-612\text{ = 204}$

then, we can conclude that 204 students do not have a touch screen phone.