2. Describing Data with Tables and Graphs
Visualizing Qualitative vs. Quantitative Data
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Use the frequency distribution below to find the class width and class midpoints.
A
Class width = 10, class midpoints = 10, 20, 30, 40, 50, 60, 70
B
Class width = 10, class midpoints = 10, 21, 32, 43, 54, 65, 76
C
Class width = 11, class midpoints = 10, 21, 32, 43, 54, 65, 76
D
Class width = 11, class midpoints = 10,20, 30, 40, 50, 60, 70
Verified step by step guidance1
To find the class width, subtract the lower limit of a class from the lower limit of the next class. For example, subtract 5 from 16.
Calculate the class width: 16 - 5 = 11.
To find the class midpoints, add the lower and upper limits of a class and divide by 2. For example, for the class 5-15, calculate (5 + 15) / 2.
Calculate the class midpoint for each class: (5 + 15) / 2 = 10, (16 + 26) / 2 = 21, (27 + 37) / 2 = 32, (38 + 48) / 2 = 43, (49 + 59) / 2 = 54, (60 + 70) / 2 = 65, (71 + 81) / 2 = 76.
Verify that the calculated class width and midpoints match the given correct answer: Class width = 11, class midpoints = 10, 21, 32, 43, 54, 65, 76.
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