A professor had students keep track of their social interactions for a week. The number of social interactions over the week is shown in the following grouped frequency distribution. How many students had at least 70 social interactions for the​ week? 40-44 5 45-49 18 50-54 17 55-59 18 60-64 10 65-69 9 70-74 4 75-79 8 80-84 0 85-89 1 The number of student was?

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