Question

For a survey, 20 students in one class were asked to name their favorite sport. the tally chart shows the result.

Basket ball - 6
soccer-7
hockey - 5
volleyball - 2

suppose all 100 students in the grade were asked to name their favorite sport. how many students would you expect to say " soccer"

Answer 1

7/20 like soccer. We can set up a proportion and cross multiply.

7/20 = x/100

20x = 700

x = 35

Another way to do this problem:
100/20 = 5
5 * 7 = 35