Question

A middle school has 470 students. Regina surveys a random sample of 40 students and finds that 28 have cell phones. How many students at the school are likely to have cell phones?

Answer 1

The answer is 329. If you set this up as a proportion you get 28/40=x/470 then you cross multiply 28x470 to get 13,160 and decide it by 40 to get 329

Answer 2

So from that i think the formula would be
$\frac{x}{470} = \frac{28}{40}$
so then you find "x" by multiplying 470 x 28 which equals 13,160. Then you divide 13,160 by 40 which equals 329.
X=329
329 students are likely to have phones