A group of students on a Mathematics for Economics course were surveyed to see how long they spent dreaming about algebra each night. The grouped frequency table is given below. a) interval cumulative time spent dreaming frequency f mid point f x x frequency less than 10 minutes more than 10 and at 12 most 20 minutes more than 20 and at 15 most 35 minutes more than 35 and at 3 most 80 minutes Efx = Ef =

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