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
|
65
|
|
0 to less than 20
|
155
|
|
0 to less than 30
|
227
|
|
0 to less than 40
|
286
|
|
0 to less than 50
|
347
|
|
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: