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?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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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?
Transcribed Image 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?
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