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QOTD#10 The table above shows the frequency distribution of [#permalink]
19 Aug 2016, 05:07
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The table above shows the frequency distribution of the heights of 80 students. What is the least possible range of the heights of the 80 students? A. 15 B. 16 C. 20 D. 24 E. 28 Practice Questions Question: 12 Page: 151 Attachment:
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Last edited by Carcass on 25 Aug 2016, 02:04, edited 1 time in total.
Edited the question




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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
19 Aug 2016, 05:14
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ExplanationRecall that the range of the numbers in a group of data is the greatest number in the group minus the least number in the group. The table shows that the minimum height of the 80 students can vary from 140 to 144 centimeters, and the maximum height can vary from 160 to 164 centimeters. Thus the least possible range of the heights is 160 – 144, or 16 centimeters. The correct answer is Choice B.
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
22 Aug 2016, 12:56
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Hi Sandy, Why the answer is not 20? (160140) Appreciate your help! Thanks sandy wrote: Explanation
Recall that the range of the numbers in a group of data is the greatest number in the group minus the least number in the group. The table shows that the minimum height of the 80 students can vary from 140 to 144 centimeters, and the maximum height can vary from 160 to 164 centimeters. Thus the least possible range of the heights is 160 – 144, or 16 centimeters. The correct answer is Choice B.



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
22 Aug 2016, 14:34
Hi HarveyKlaus, You are right it should be 20. or 160  140. Regards
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
23 Aug 2016, 06:05
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So in this context the maximum possible range should be : 164144 = 20? Or it should be : 164140 = 24?



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
23 Aug 2016, 08:20
yasir9909 wrote: So in this context the maximum possible range should be : 164144 = 20? Or it should be : 164140 = 24? Hey yasir9909, No that not correct. Range is the difference between the smallest and the largest measurement. For example: 5,3,13,1,10 Range is 131 =12. Now suppose you want to make it into a frequency distribution table with 4 classes say. Then width of each class would be range/no of classes, or \(\frac{12}{4}=3\).
Class  Frequency  14  2  58  1  912  1  1316  1 
So range is 131 or 164 = 12. As we know from the dataset
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
23 Aug 2016, 08:29
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But my question is still unanswered;what would be the maximum possible range of the heights of the 80 students according to this table?
I need to make my concept crystal clear on range in context of frequency distribution;though simple definition of range is quite straightforward :
Range = Maximum Value  minimum Value



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
23 Aug 2016, 08:36
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yasir9909 wrote: But my question is still unanswered;what would be the maximum possible range of the heights of the 80 students according to this table?
I need to make my concept crystal clear on range in context of frequency distribution;though simple definition of range is quite straightforward :
Range = Maximum Value  minimum Value No, The limits of a frequency distribution table are not arbitrary as I have shown with the example above. They depend on the range of the data. Range is: class width * no of classes = 4 * 5 for the original question .............................................= 3 * 4 for the example in my post above, So you can get the range from: upper limit of first class  upper limit of the last class. or lower limit of first class  lower limit of the last class.
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 00:51
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Why can't it be 16???? if we consider the lowest height of six students is 144 and highest height is 160 then 160144 = 16



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 01:32
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Sonalika42 is right. For first row, its possible that all students have same height of 144 cms and for last row all students can have same height of 160 cms. Therefore least possible range is 16044 = 16. Answer should be B



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 05:10
phoenixio wrote: Sonalika42 is right. For first row, its possible that all students have same height of 144 cms and for last row all students can have same height of 160 cms. Therefore least possible range is 16044 = 16. Answer should be B Hi phoenixio and Sonalika42, Any frequency distribution has the information about the range within the table. I.e limits of each row is not arbitrary they are related to the range of the original dataset. The range of the dataset is equally divided into classes. So it is quite possible that all the 6 students in 140 to 144 bracket are 144 cms and all 4 students in 160 to 164 is 160 cms. Then the range is 16. However the frequency distribution table would have had classes: 144  147 148  151 152  155 156  159 160  163 When you make a frequency distribution table the range information about the original dataset is not lost. Regards
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 05:58
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thank you for replying Sandy What i have understood from what you have said above is(pls correct me if i am wrong) that if the the distribution list has a range of 140144 ,this range is not arbitrary ,it simply means that there is atleast one student with a height of 140cms else that range would not have begun with 140 ,it could have been any other value. Is that what you are saying? plzz do reply



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 06:53
Sonalika42 wrote: thank you for replying Sandy What i have understood from what you have said above is(pls correct me if i am wrong) that if the the distribution list has a range of 140144 ,this range is not arbitrary ,it simply means that there is atleast one student with a height of 140cms else that range would not have begun with 140 ,it could have been any other value. Is that what you are saying? plzz do reply No thats not what I am saying. Range of a dataset in a frequency distribution is fixed: class size * number of classes. Its possible all 4 have height 144 and then atleast one will have height 164. But the range remains 20.
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 07:45
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@ Sandy,
This is a question from ETS official guide and explanation from guide is as:
Recall that the range of the numbers in a group of data is the greatest number in the group minus the least number in the group. The table shows that the minimum height of the 80 students can vary from 140 to 144 centimeters, and the maximum height can vary from 160 to 164 centimeters. Thus the least possible range of the heights is 160 – 144, or 16 centimeters. The correct answer is Choice B.



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
24 Aug 2016, 08:02
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I totally agree with Phoenixio



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
25 Aug 2016, 02:03
Sorry for the inconvenience. Maybe a typo by Sandy. Thank you guys for the feedback. OA fixed
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
25 Aug 2016, 11:42
phoenixio wrote: @ Sandy,
This is a question from ETS official guide and explanation from guide is as:
Recall that the range of the numbers in a group of data is the greatest number in the group minus the least number in the group. The table shows that the minimum height of the 80 students can vary from 140 to 144 centimeters, and the maximum height can vary from 160 to 164 centimeters. Thus the least possible range of the heights is 160 – 144, or 16 centimeters. The correct answer is Choice B. Hey, I know its the official solution and that was what I originally posted. However when I went back and checked the definitions from books there is no minimum/maximum range of a frequency distribution. When you make a table classes of the table are a function of the range of under lying dataset. Here is another sample problem: http://www.math.utah.edu/~anna/Sum12/Le ... tion21.pdfPS: Please look at the examples I am posting. I understand very clearly your argument for "minimum range". What I am trying to say is there is no such thing called a "minimum range" for a frequency distribution table.
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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
25 Aug 2016, 11:53
@ Sandy i am getting what you are saying but my point was since no dataset was provided in the question ,we are free to assume that all 6 could be 144 and all 4 could be 160 its all about possibility. the attachment which you have provided read step 3:
Steps for constructing a frequency distribution from a data set 1. If the number of classes is not given, decide on a number of classes to use. This number should be between 5 and 20. 2. Find the class width: Determine the range of the data and divide this by the number of classes. Round up to the next convenient number (if it’s a whole number, also round up to the next whole number). 3. Find the class limits: You can use the minimum data entry as the lower limit of the first class. To get the lower limit of the next class, add the class width. Continue until you reach the last class. Then find the upper limits of each class (since the classes cannot overlap, and occasionally your data will include decimal numbers, remember that it’s fine for the upper limits to be decimals). 4. Count the number of data entries for each class, and record the number in the row of the table for that class. (The book recommends using “tally” marks to count)



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
25 Aug 2016, 11:58
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@ Sandy i agree with you when you say that there is no such thing as minimum range for a frequency distribution table, but in the given scenario its about how minimum can we make the range. And since no data set is provided we are at liberty to minimize the range.



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Re: QOTD#10 The table above shows the frequency distribution of [#permalink]
10 Dec 2016, 09:44
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i got really confused, as you mentioned that range = greatest value least value so it should be 164140= 24!!! plz answer me !!




Re: QOTD#10 The table above shows the frequency distribution of
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