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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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a = 70; h = 10 

∴ \(\overline{x}= a+\frac{\Sigma f_iu_i}{\Sigma f_i}\times h\)

\(\overline{x}\) = 70 − \(\frac{2}{35}\) × 10

= 70 – \(\frac{2}{35}\) × 10 

= 70 – \(\frac{20}{35}\)

= 70 – 0.57142 

= 69.4285 

≃ 69.43%

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