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The table given below present the Rainfall (in mm) in two cities on different days of a week. Days Rainfall (in mm) City 1 City 2 D1 82 81.6 D2 78 79.4 D3 76.2 78.3 D4 81.6 77.7 D5 79.4 84 D6 84 83 D7 83.8 82   What is the difference (correct up to two decimal places) in average rainfall in two cities per day?

The table given below present the Rainfall (in mm) in two cities on different days of a week. Days Rainfall (in mm) City 1 City 2 D1 82 81.6 D2 78 79.4 D3 76.2 78.3 D4 81.6 77.7 D5 79.4 84 D6 84 83 D7 83.8 82   What is the difference (correct up to two decimal places) in average rainfall in two cities per day? Correct Answer 0.15 mm

Average rainfall of city 1 = (82 + 78 + 76.2 + 81.6 + 79.4 + 84 + 83.8)/7 = 565/7 mm

And the average rainfall in city 2 = (81.6 + 79.4 + 78.3 + 77.7 + 84 + 83 + 82)/7 = 566/7 mm

⇒ The difference between the average rainfall = 566/7 – 565/7

∴ The required difference between the average rainfall = 1/7 = 0.15mm

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