The annual rainfall at a certain place is normally distributed with mean 30. If the rain falls during the past eight years are 31.1, 30.7, 24.3, 28.1, 27.9, 32.2, 25.4 and 29.1. Can we conclude that...

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Extracted text: The annual rainfall at a certain place is normally distributed with mean 30. If the rain falls during the past eight years are 31.1, 30.7, 24.3, 28.1, 27.9, 32.2, 25.4 and 29.1. Can we conclude that average rainfall during the past eight years is less than the normal rainfall?