Cumulative frequency of the fourth class

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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)

Reference no: EM131360955

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