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According to the data values and frequency distributions of the breakdowns occurred in a factory as given in the table below, calculate the Harmonic mean.

No of breakdowns 30 to 39 40 to 49 50 to 59 60 to 69 70 to 79 80 to 89 90 to 99 Frequency 2.0 3.0 11.0 20.0 32.0 25.0 7.0

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