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Stories in the World's Tallest Buildings The number of
Chapter 2, Problem 18E(choose chapter or problem)
Stories in the World’s Tallest Buildings The number of stories in each of a sample of the world’s 30 tallest buildings follows. Construct a grouped frequency distribution and a cumulative frequency distribution with 7 classes.
88 88 110 88 80 69 102 78 70 55 79 85 80 100 60 90 77 55 75 55 54 60 75 64 105 56 71 70 65 72
Questions & Answers
QUESTION:
Stories in the World’s Tallest Buildings The number of stories in each of a sample of the world’s 30 tallest buildings follows. Construct a grouped frequency distribution and a cumulative frequency distribution with 7 classes.
88 88 110 88 80 69 102 78 70 55 79 85 80 100 60 90 77 55 75 55 54 60 75 64 105 56 71 70 65 72
ANSWER:
Step 1 of 3
When the range of the data is large, the data must be grouped into classes that are more than one unit in width, in what is called a grouped frequency distribution.
It’s given that the groped distribution must contain 7 classes.
The range: R = highest value - lowest value = 110 - 54 = 56
Find the class width by dividing the range by the number of classes
Class width =
The lower class limit is 54 which is the smallest data value. The upper class limit is 61, ie;
54 + 8 - 1 = 61
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