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Calculate the mean of the following data with the help of shortcut method. Class interval \( 0 - 5 \quad 5 - 10 \quad 10 - 15 \quad 15 - 20 \quad | 20 - 25 \) Frequency \( \quad 4 \quad 6 \quad 5 \quad 5 \quad 8 \quad 8 \quad 3 \quad 3 \quad 3 \quad 7 \)

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