Perform

Now that you’ve seen the variety of ways in which the SAT can test you on scatterplots, try the following questions to check your understanding. Give yourself 4 minutes to tackle the following three questions. Make sure you use the Kaplan Method for Math as often as you can. Remember, you want to emphasize speed and efficiency in addition to simply getting the correct answer.

7. 

   The graph above shows the percent of school age children in the United States who received immunizations for various illnesses between 1996 and 2012. What was the average rate of increase in the percent of children immunized over the given time period?

   1.   5%
   2. 10%
   3. 25%
   4. 70%

8. A marketing team is conducting a study on the use of smartphones. In a certain metropolitan area, there were 1.6 million smartphone users at the end of 2014. The marketing team predicts that the number of smartphone users will increase by 35% each year. If y represents the number of smartphone users in this metropolitan area after x years, then which of the following equations best models the number of smartphone users in this area over time?

   1. y = 1,600,000(1.35)^x
   2. y = 1,600,000(35)^x
   3. y = 35x + 1,600,000
   4. y = 1.35x + 1,600,000

9. 

   A microbiologist is comparing the growth rates of two different yeast strains. She indirectly measures the number of yeast cells by recording the optical density (OD600) of each strain every ten hours. The measurements are presented in the graph above. Based on the data, which of the following is NOT a true statement?

   1. Strain 1 had a higher OD600 reading than Strain 2 throughout the monitored period.
   2. The growth rate of Strain 2 was less than the growth rate of Strain 1 until hour 50, at which point Strain 1’s growth rate became the lesser one.
   3. Between hours 50 and 70, Strain 2’s OD600 reading increased by approximately 0.03 every hour.
   4. The growth rate of Strain 1 was greater than the growth rate of Strain 2 throughout the monitored period.