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The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.

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The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.

Literacy rate (in%) 45-55 55-65 65-75 75-85 85-95
Number of cities 3 10 11 8 3

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Here, we use step deviation method to find mean.

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