(Answered) The following table gives the cumulative frequency

Statistics

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

What is the cumulative frequency of the fourth class? (rounded to 4 decimal places)

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