The numbers of hours worked (per week) by 420 statistics students are shown below. Number of Hours Frequency 0 s x < 10 10 sx < 20 20 s x < 30 30 s x < 40 10 100 220 90 The midpoint of the last class is O a. 34 O b. 35 O c. 50 O d. 34.5

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