ITBS Data Interpretation and Graphs 3

Question 1

A frequency table shows: Red=12, Blue=8, Green=15, Yellow=5. What fraction of students chose Red?

Accepted Answer

12/40

Answer

Total = 12+8+15+5 = 40; Red fraction = 12/40 = 3/10 (both 12/40 and 3/10 are equivalent, but 12/40 is the direct answer).

Question 2

A line graph shows temperatures dropping from 70°F at noon to 55°F at midnight. What was the average rate of decrease per hour over 12 hours?

Accepted Answer

1.25°F/hr

Answer

(70 − 55) ÷ 12 = 15 ÷ 12 = 1.25°F per hour.

Question 3

A bar graph shows students enrolled per grade. Grade 3 has twice as many students as Grade 6. If Grade 6 has 45 students, how many are in Grade 3?

Accepted Answer

90

Answer

Twice 45 = 90 students in Grade 3.

Question 4

A pie chart is divided into 4 equal sections. What percent does each section represent?

Accepted Answer

25%

Answer

100% ÷ 4 equal sections = 25% each.

Question 5

A table lists five quiz scores: 88, 76, 94, 88, 74. What is the mode?

Accepted Answer

88

Answer

88 appears twice, more than any other score, making it the mode.

ITBS - Iowa Test of Basic Skills Exam Practice Test