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in Mathematics by (138k points)

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
Let assumed mean A = 70 and class size h = 10

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