A random sample of 30 seventh grade students shows that 12 of them own a dog. How many seventh grade students can you predict own a dog if the entire population of seventh graders is 400?

160

Step-by-step explanation:

proportion: 12/30 = 0.4

0.4 * 400

160

160

Step-by-step explanation:

If out of 30 7th graders, 12 own a dog then when you have 400 of them, 160 will have a dog as well.

The way I did this was by 400/30: which was 13.3 repeating. I then mutliplied this number by 12, to find the final answer of 160.