Making Inferences with Statistics

The sample is $$200$$  .

there are $$\frac{78}{200}$$   so we can predict how many out of $$28,000$$   by setting up a proportion.

$$\frac{78}{200}=\frac{x}{28,000}$$  

Then cross multiply and divide.

First total the number of subscriptions that are represented $$30$$   

there are $$\frac{3}{30}$$  so we can predict how many out of $$250$$   by setting up a proportion. $$\frac{3}{30\ }=\ \frac{x}{250}$$  

Then cross multiply and divide.

The circle graph shows the results of a survey of teens and where they would prefer to spend a family vacation. Predict how many of 4,000 teens would prefer to go to an amusement park?

Convert the 45% to a decimal $$0.45$$  

Multiply $$0.45\ x\ 4000$$