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Find the mean literacy rate: Literacy …

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Find the mean literacy rate: Literacy rate 45-55,55-65, 65-75, 75-85,85-95 Number of cities 3,10,11,8,3

    • Posted by Palavalasa Harsha Vardhan 2 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Preeti Dabral 2 years, 3 months ago

    Marks No. of students 
    fi​    		 xi​  fi​xi​ 
    45-55 3 50 150
    55-65 10 60 600
    65-75 11 70 770
    75-85 8 80 640
    85-95 3 90 270
      Σfi​=35    Σfi​xi​=2430 

    We know that, arithmetic mean {tex}=\frac{\Sigma \mathrm{f}_{\mathrm{i}} \mathrm{x}_{\mathrm{i}}}{\Sigma \mathrm{f}_{\mathrm{i}}}{/tex}

    ∴Mean literacy rate{tex}=\frac{2430}{35}=69.43 \%{/tex}

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