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2. The number of fatal accidents in a city is, on average, 12 per month. After a signaling campaign and improvement of urban roads, 8,
2. The number of fatal accidents in a city is, on average, 12 per month. After a signaling campaign and improvement of urban roads, 8, 11, 9, 7, 10, 9 fatal accidents were recorded in 6 consecutive months. Was the campaign effective?
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