The numbers of hours worked (per week) by 400 statistics students are shown below. Number of Hours Frequency Osx< 20 20 sx< 40 40 s x < 60 50 s x < 80 40 70 210 80 The relative frequency of students working less than 20 hours is O a.0.90 O b. 0.10 O c. 40 O d. 110

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