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the cumulative frequency distribution of the commuting time (in minutes) from home to work

the cumulative frequency distribution of the commuting time (in minutes) from home to work

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Author: MARK Lee
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QNT 275 Week 5 Final Exam Link

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the cumulative frequency distribution of the commuting time (in minutes) from home to work  
 
The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city.
Time (minutes) f
0 to less than 10 66
0 to less than 20 148
0 to less than 30 220
0 to less than 40 294
0 to less than 50 356
0 to less than 60 400
The sample size is:
  
The percentage of persons who commute for less than 30 minutes, rounded to two decimal places, is:
  %
The cumulative relative frequency of the fourth class, rounded to four decimal places, is:
  
The percentage of persons who commute for 40 or more minutes, rounded to two decimal places, is:
  %
The percentage of persons who commute for less than 50 minutes, rounded to two decimal places, is:
  %
The number of persons who commute for 20 or more minutes is:

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