The cumulative frequency table below shows the length of time that 30 students spent text messaging on a weekend. Minutes Used 31-40 31-50 31-60 31-70 31-80 Cumulative Frequency 2 5 10 19 30 Which 10-minute interval contains the first quartile? mummains the 1) 31-40ery S 2) 41-50 3) 51-60 4) 61-70 Hibim send deled à bos mou

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