Math Lesson 8-4 Mastery Check

The histogram shows the scores on a recent science test. Select all of the true statements about the data.

• Only 2 students scored less than 71 on the test.

• More than half the students scored 81 or better.

• More students scored between 91 and 100 on the test than scored between 71 and 80.

• There were 12 students who scored 80 on the test.

• The same number of students scored between 81 and 90 on the test as scored between 61 and 80.

Explain how to choose the intervals for a frequency table to represent the data.

• The data values have a spread of 91 - 22 = 69 centimeters. Intervals with a range of 10 centimeters are reasonable.

• Intervals should always be 1 centimeter regardless of the data spread.

• Choose intervals randomly without considering the data range.

• Intervals must be equal to the smallest data value.

Kianna and her friends collected pledges for a local walk-a-thon. They recorded the number of pledges that they each received in a frequency table. How many walkers received more than 39 pledges?

• A. 13

• B. 11

• C. 7

• D. 12

Raphael surveyed his coworkers to find out how many hours they spend on the Internet each week. The results are shown below. 14, 22, 10, 6, 9, 3, 13, 7, 12, 2, 26, 11, 13, 25 Complete the frequency table. Hours on the Internet | Hours | Frequency 0–7 | 8–15 | 16–23 | 24–31 |

• 0–7: 4 8–15: 6 16–23: 2 24–31: 2

• 0–7: 3 8–15: 7 16–23: 2 24–31: 2

• 0–7: 5 8–15: 5 16–23: 2 24–31: 2

• 0–7: 4 8–15: 5 16–23: 3 24–31: 2

The histogram shows the results of a survey asking students how many windows are in their homes. How many students have fewer than 10 windows in their homes?

The following are the scores obtained by a group of 30 Grade 7 students in Science Quiz. What is the frequency of the scores from 6-10?

• 7

• 4

• 13

• 3

Tags

CCSS.6.SP.A.2

CCSS.6.SP.B.5

How many classes are in this table?

• 1

• 2

• 3

• 4