TSIA practice 1

A history class is made up of 12 tenth graders and 9 eleventh graders. The tenth graders averaged 77 on the midterm exam, and the eleventh graders averaged 91 on the midterm exam. What was the average grade on the midterm exam for the entire class?

• 82

• 83

• 84

• 85

Reyna has 5 coins worth 10 cents each and 4 coins worth 25 cents each. If she chooses two of these coins at random, what is the probability that the two coins combined will be worth at least 35 cents?

The following table shows the number of tornadoes reported each month of 2015 in Kansas. Which of these is the median number of tornadoes reported for these data?

• 0

• 37.5

• 81

• 81.75

Biologists discovered a compound that can kill off 40% of a bacterial population every hour. If a population consists of 10 million bacteria at the moment the compound is administered, which of these graphs correctly models the number of bacteria, B(t), remaining at time t hours after the compound is administered?

• 
• 
• 
• 

Which of the following is the best choice for the equation of the line of best fit for the data shown in this scatterplot?

• y = -1.1x + 16

• y = 0.72x - 2.1

• y = -0.8x - 1.3

• y = -2

• 100 pounds

• 225 pounds

• 350 pounds

• 400 pounds

A novice archer is shooting at a target. Hitting different parts of the target results in different amounts of points, as indicated in the picture. Since the archer is just learning, there is an equal chance of his hitting the target anywhere. What is the probability that he hits the rectangle outside the circles?

If there are 2.2 pounds in 1 kilogram, how many pounds are there in x kilograms?

• m = -1

• m = 1

• m < 1

• m > 1