Question

a survey found that 9 out of 100 randomly selected people are left-handed. On the basis of this survey, how many people in a group of 8000 are likely to be left-handed?

1. 72
2. 720
3. 800
4. 900

Answer 1

the answer is 720

8000/100 = 80
9x80=720

Answer 2

The answer is 720 because if you multiply 9 x 8 and add on one zero you get 720.