80 students entered a dancing competition. The table gives information about the length of time, in minutes, for which each student spent dancing. Time (m)        Frequency 0 < m ≤ 12                 11 12 < m ≤ 24                25 24 < m ≤ 36                23 36 < m ≤ 48                15 48 < m ≤ 60               6 Work out an estimate for the mean length of time the students spent dancing.

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